Top 5 Transformers toys sold at retail but NOT in the US
I live in Canada and I can say that the US is one of the best places in the world to be a Transformers fan. Transformers usually cost less there than almost anywhere else in the world. Not only that, but the US has a greater access to exclusive Hasbro Transformers such as the SDCC and Botcon sets. Even lines which were found elsewhere first, like GDO, Masterpiece and Prime First Edition, eventually find their way to US retail. However, a few figures sometimes fall in the cracks and never make their way. Either Hasbro wont pick up distribution of particular Takara products or a particular figure will simply never be spotted. Even laws can come into play. These are a handful of such cases, just to give an idea of the variety of stuff that was found elsewhere throughout the years, and I didn't want to just stick to G1. Let us know which toys you would have loved to find in stores but never did.
5. The Transformers Alternity Line
For some reason, there is a bunch of criticism over the Alternators line and I don't understand it. This was a great project from Hasbro and Takara, going back to the Diaclone roots of favoring the alt mode and making perfect model cars that can fit with other lines from different companies. Except the technology changed and you could get more articulated robot modes by then. I thought it was an incredible line and I still think so. In any case, the alternators line lost some steam in the US and when Japan came up with the follow up Alternity line featuring a 1:32 scale (rather than 1:24), Hasbro didnt pick it up. That is too bad because it had some very cool ideas, like having the seekers be cars with the car's shell forming the robot wings. Like that they keep their distinctive seeker motif while also having an alt mode that stray from tradition (which would still scale with the rest of the line). They also featured die cast parts, rubber tires and style money can't buy (check out that Megatron below!). There were only a handful of original molds but they all exuded style and are the most minute toys ever made. And they were never distributed outside Japan.
Transformers Alternity Banzai-Tron (Crystalo Black) Gallery
Transformers Alternity Optimus Prime (Vibrant Red) (Convoy (Vibrant Red)) Gallery
4. Transformers Arms Micron War Breakdown
From the beginning, the Prime line and the States were at odds. The First Edition figures were available worldwide aside from the US at first for quite a while. Instead, they had the less accurate and less detailed Robots in Disguise subline toys in stores. Sure, some were fine (like Vehicon and Arcee) but for a while, it seemed the collector oriented First Edition line would never see the light of day. Eventually though, every toy found its way to Toysrus though not every location got them and there were not too many to go around. Worse, by that time, many fans had already paid a premium to get these toys they thought they would not see at retail.
That was not the end of woes with the Prime line though. While there were a bunch of fun redecos like the seekers and Transformers Arms Micron Ironhide (who was supposed to be the original version of the Kup mold Hasbro released, just look at that head) found in the Takara line that Hasbro never distributed, none of those decisions hurt more than not distributing Breakdown. Unlike most other toys never gotten in the US, this was an actual show character. Someone who simply wanted to have the Decepticon team on his shelf just couldn't depend on retail releases. And unlike the Unicron mold that was also Japan exclusive, this was a phenomenal mold. I can't confirm that though since none of the other uses of that mold (such as Swerve and Silas Breakdown) were distributed by Hasbro either. While he leaves the biggest gap in the Prime line, there were other cool releases for the line that never came to the states, and actually were distributed by Hasbro, such as Beast Hunters Cyberverse Ultra Magnus, Unicron Megatron (both the Construct bot and the Cyberverse toy) and freaken BLUDGEON!
3. MP-5 Destron Leader Megatron (Masterpiece)
This is the only mold from the Masterpiece line that is guaranteed to NEVER EVER be released in the US, due to toy gun laws. And it happens to be Megatron, the main antagonist in all the Transformers brand. Your Walmart 20th Anniversary Optimus is thus left rivaless unless you import him. You would think that this alone would propel him to the top spot but he is held down a bit by a week design. While it is impressive that he was designed in two weeks, the thin legs and ultra fiddly transformation do give a hint at the rushed process. However, the engineering present here is utterly insane, by far one of Takara's most complex transformers ever engineered. While the toy has its faults, its take on the transformation is so smart that this has been the default guide for companies trying to make their own unofficial version years later.
2. Transformers Victory Liokaiser
G1's best combiner never came to the US. He was part of the Victory line where quite a few other molds never came (that could be a list of it's own)and he is the very first combiner to integrate the fists and feet with the components. This is something Hasbro couldn't even pull off with Titan Devastator in 2015. All you needed to keep was his combiner head. But beyond that, there is a lot to love in this toy. The design itself was totally unique at the time, with an animal themed combiner while none of the alt modes were animals. Instead, the individual robots had shamanistic helmets representing their animal link as well as a breastplate which could transform into an animal and serve as a gun. Don't be surprised if you see this guy again on a list of most needed reissues.
1. Transformers Super God Masterforce Overlord
This number one is almost by default. This is one of the bigger G1 Transformers sets, with three modes (like G1 Scorponok) and made up of a bunch of parts including two seperate alt modes. It was available in Japan, Europe and Australasia. However, unless the planets align and some miracle like an "encore" happens, it will never come out in the North America, let alone the US. Instead of feeling sad (please don't check EBay), just sit back and bask in his glory:
Honourable mentions: SO MANY. Let's see, there's G1 Thunderclash, Binaltech Arcee, the Action Masters Elite (at least those somewhat transformed), BWN Chorada, the G1 Predators, G1 Star Saber and so much more. It would be easier saying which ones we'd rather not get (like the Big Rescue Force) so let us know in the comments which ones you wished came out in the US. Or even better, let us know which ones you wished came to your country.
It always works that way like that I dont spoil the list while giving an idea of what will be talked about.
While I could get some of them off various sites, it would have been so much more enjoyable to have gotten them as a kid from a store with eyes full of wonder at them. I just snagged a cohrada 2 pack and stampy 2 pack off bbts, so will soon be recapturing that feeling 
