[Ninjinister]

For TMNT, the top two commercial releases are:

Next Mutation Camo-Blitz Leo
http://myteefinestuff.com/product_in...32c6e14a806086

Next Mutation Camo-Hydro Skimmer
Teenage Mutant Ninja Turtles including TMNT weapons and the TMNT action figures.

Sadly I have neither of these, but I would kill for just the loose figures (I'm not a big vehicle guy).

The next one, which is a grail for most collectors, is Scratch, the mutant cat prisoner. He can go for as much as $600 carded

Lumped in with the rest of the "big grails" that go for over $100 carded (and sometimes much more, depending on flux) are Hotspot, Warrior Chrome Dome, and Warrior Rocksteady. The latter of these is almost impossible to find in good condition, as literally every one I've seen in the past 10 years has had its paint chipped off - even on card.

From other countries, there's a variant of Super Shredder in Europe with purple armor that sometimes goes for a pretty penny. It's also tough to find in good condition, as the plastic for its armor and the paint used is inferior. Some of the Japanese-only figures, especially those from the anime (Saint Turtle, Devil Shredder and Dark Devil Shredder are the big ones) also go for like $125 sealed. I haven't seen any in a while, but the UK-exclusive Alien Hunters figures might be worth quite a bit now. EDIT: Oh, I forgot the solitary one from the 2003 series that goes for over $100 carded, Quarry.

I'm sure there's more, but this is all that I can think of off the top o' my noggin.

SECOND EDIT: Shogun Triceraton and Shogun Shoate are usually rather sought after, as well.