I got the first one, then they went and rereleased it in a keep case (mines in the horrible snapper case).
there is also a box set of the 3 movies, that ive seen in the store a few times but not recently, you can also find it online, though if my memory serves me correctly the box set has different art then the one i remember in the store so it may be a different set.
*edit* I also have the original comics, but they arent individual, the are the compiled into 3 or 4 'books' anyone remember that spin off comic series with the other mutants, think it was called mut-animals. I have a bunch of those (probably missing the last few, dont know how many issues it ran for though)
-Darth Simon