I picked up Skyreign's limbs today at Target. I actually kinda like 'em, especially Trailbreaker. Wheeljack straight up suuuucks though. Not only is he way too plain, but his plastic feels soft and his tabs aren't very good at staying in place.
I also saw a Cyberverse Optimus Maxmimus at Goodwill. Well, most of one anyway, he didn't have arms. I considered grabbing him to use as a base mode, but he's got too many holes and I don't think it would look good next to the upcoming TR bases. My last trip to Goodwill was pretty good, got a Night Ops Ratchet for 3 bucks(again without arms, what's the deal with that?) some Constructbots for 3 bucks(mostly for the random weapons), and the little Roller that comes with Legends class Optimus for 50 cents.
I'm holding out hope I'll somehow stumble across a Metroplex at a thrift store sometime, lol.
Also, a little tip that I'm not sure where else to post, but it's helpful with big hauls of new figures-

Cat nail trimmers are awesome for clipping those little plastic tie-downs. I've been using them for awhile and it makes unboxing a lot easier. They even work on the old paper/rope tie-downs. I've found it to be much quicker than a knife or scissors, though in some extremely tight spots I'll still use a small knife.