Metroplex Accessories Catch-All Thread

With so many things out or coming out for Metroplex, I thought I'd make a thread collecting them all in one place. A place for someone to have a quick guide on what is out there, and where debates on competing accessories can take place in neutral territory without bogging down the individual items' threads.
(Prices and links presented in this post are accurate as of the time of this writing, but are subject to change.)
So, here's everything worth note that I know about. This first post may be edited with updates if more items become available, or there is significant new or updated information about one of the already mentioned items.
Stickers:
Two options I know of here. The first is from the well known Reprolabels.

Available on the Reprolabels website for $35.00. For those who have a version of Metroplex that came with two large red guns, there is a supplemental sticker set for an additional $3.50.
The second is from a company called Eness. They have their own thread here.

Not sure where to buy these ones or for how much. There are a couple on eBay at the time of this writing for $50.00 - $70.00. If anyone can supply a link to somewhere else that sells them, I can edit this top post to include that, as well.
Six-Gun:
There are three main competitors here. Alphabetically, they are from Before and After, Iron Factory, and TFC Toys.
The Before and After one, which has a thread here, comes in two options.

The large black guns shown in the picture above are not included, as they are guns that come with Metroplex. The figure breaks apart to form two more guns and a turret for Metroplex's city mode. (There is one other item that comes with this figure, which will be discussed in more detail below.)
$82.99.
Big Bad Toy Store: Black Arm / Red Arm
TF Source: Black Arm / Red Arm
As a footnote, a company called Keith's Fantasy Club (KFC) sells fully articulated upgrade hands for MP-10 Optimus Prime. It has been discovered that, without any modification, these hands also can fit on Six Sigma. Thus, they can be an upgrade for your upgrade. $19.99, BBTS. $19.95, TFSource.
The Iron Factory option (see individual thread here) is a much different take on Six-Gun and is named Scamp. Being a Legends Class sized figure, he scaled to stand about the same height as Scamper. Rather then forming guns scaled to be hand held by Metroplex, he breaks apart into little weapon emplacements to attach to Metroplex's various modes. (Like the Before and After version, something else comes with this figure that will be talked about more below.)

Big Bad Toy Store, $54,99
TFSource, $54.94
The TFC Toys option (individual thread here):

Breaks apart into two black guns, two red guns, and one larger red and white gun that vaguely matches with the large red gun that comes with Metroplex.
$87.99. Big Bad Toy Store. TF Source.
Slammer:
There are three options for this one.
One of them actually comes with the Before and After Six-Gun. (See price and links above.) It can be a tank, a tower for Metroplex's city mode, or a weapon for Six-Gun to hold.

The second option also comes with a Six-Gun, the Iron Factory option. (See price and links above.) This one gives Slammer a robot mode! Together with the Six-Gun he is sold with and the Scamper that comes with Metroplex, it gives Metroplex a trio of Legends Class sized companions.

The final option, from X2 Toys, has an individual thread here.

It is a gun, designed to match with the large red gun that comes with Metroplex, which can transform into a tank. It will be available in two colours, red (to better match Metroplex's other gun) and white (as a better Slammer homage). Worth note is that the white one is being produced in lesser quantities, and unfortunately is thus being sold at a higher price.
Big Bad Toy Store: Red - $42.99 / White - $54.99
TF Source: Red - $42.95 / White - $47.95
Replacement Head, with Weapon Turrets:
From Unique Toys. Thread here.

A new head for Metroplex, along with small weapon turrets that can be plugged into various holes on Metroplex.
Big Bad Toy Store, $44.99. TF Source, $44.95.
MegaMoonMan Upgrades -- Hands, Knees, and Ramp Extensions:
Individual thread here.

A 3D printed set of accessories that give Metroplex more articulated hands that also transform to better hide in alt modes, new knees with an additional pivot point to provide for a more "G1" looking city mode, and ramp extensions to give you a ramp that can actually be useful.
Available by PM'ing MegaMoonMan on the TFW message board. $60 for a complete set, also available as individual pieces.
(Prices and links presented in this post are accurate as of the time of this writing, but are subject to change.)
So, here's everything worth note that I know about. This first post may be edited with updates if more items become available, or there is significant new or updated information about one of the already mentioned items.
Stickers:
Two options I know of here. The first is from the well known Reprolabels.

Available on the Reprolabels website for $35.00. For those who have a version of Metroplex that came with two large red guns, there is a supplemental sticker set for an additional $3.50.
The second is from a company called Eness. They have their own thread here.

Not sure where to buy these ones or for how much. There are a couple on eBay at the time of this writing for $50.00 - $70.00. If anyone can supply a link to somewhere else that sells them, I can edit this top post to include that, as well.
Six-Gun:
There are three main competitors here. Alphabetically, they are from Before and After, Iron Factory, and TFC Toys.
The Before and After one, which has a thread here, comes in two options.

The large black guns shown in the picture above are not included, as they are guns that come with Metroplex. The figure breaks apart to form two more guns and a turret for Metroplex's city mode. (There is one other item that comes with this figure, which will be discussed in more detail below.)
$82.99.
Big Bad Toy Store: Black Arm / Red Arm
TF Source: Black Arm / Red Arm
As a footnote, a company called Keith's Fantasy Club (KFC) sells fully articulated upgrade hands for MP-10 Optimus Prime. It has been discovered that, without any modification, these hands also can fit on Six Sigma. Thus, they can be an upgrade for your upgrade. $19.99, BBTS. $19.95, TFSource.
The Iron Factory option (see individual thread here) is a much different take on Six-Gun and is named Scamp. Being a Legends Class sized figure, he scaled to stand about the same height as Scamper. Rather then forming guns scaled to be hand held by Metroplex, he breaks apart into little weapon emplacements to attach to Metroplex's various modes. (Like the Before and After version, something else comes with this figure that will be talked about more below.)

Big Bad Toy Store, $54,99
TFSource, $54.94
The TFC Toys option (individual thread here):

Breaks apart into two black guns, two red guns, and one larger red and white gun that vaguely matches with the large red gun that comes with Metroplex.
$87.99. Big Bad Toy Store. TF Source.
Slammer:
There are three options for this one.
One of them actually comes with the Before and After Six-Gun. (See price and links above.) It can be a tank, a tower for Metroplex's city mode, or a weapon for Six-Gun to hold.

The second option also comes with a Six-Gun, the Iron Factory option. (See price and links above.) This one gives Slammer a robot mode! Together with the Six-Gun he is sold with and the Scamper that comes with Metroplex, it gives Metroplex a trio of Legends Class sized companions.

The final option, from X2 Toys, has an individual thread here.

It is a gun, designed to match with the large red gun that comes with Metroplex, which can transform into a tank. It will be available in two colours, red (to better match Metroplex's other gun) and white (as a better Slammer homage). Worth note is that the white one is being produced in lesser quantities, and unfortunately is thus being sold at a higher price.
Big Bad Toy Store: Red - $42.99 / White - $54.99
TF Source: Red - $42.95 / White - $47.95
Replacement Head, with Weapon Turrets:
From Unique Toys. Thread here.

A new head for Metroplex, along with small weapon turrets that can be plugged into various holes on Metroplex.
Big Bad Toy Store, $44.99. TF Source, $44.95.
MegaMoonMan Upgrades -- Hands, Knees, and Ramp Extensions:
Individual thread here.
A 3D printed set of accessories that give Metroplex more articulated hands that also transform to better hide in alt modes, new knees with an additional pivot point to provide for a more "G1" looking city mode, and ramp extensions to give you a ramp that can actually be useful.
Available by PM'ing MegaMoonMan on the TFW message board. $60 for a complete set, also available as individual pieces.