Well, as far as I know they are currently 6 sets of Mega Bloks out now (the Lair, Battle Shell Bridge, 1/4 Pipe (this set contains the Casey you wre lookin for), Radical Ramp, Mutation Garage, and Space Lab). I have still seen the Lair out still, but I don't know if I would call it "readily available". The sets that ARE all over the place are the newest 2, the Garage and Space Lab. Those sets each come with an Elite Guard and a turtle. Unfortunately, there is NOT a baxter figure, only the turtles, Shredder, Foot, Casey, and the Elite. Hope this helps!
