Where do you live?
The ML series VII & VIII were as rare as hen't teeth at Wal-Mart but IX (aka: the Galactus series) is everywhere now... TRU, Target, Wal-Mart and comic shops.
If you need something and have no sources let me know and I'll be glad to help you out.
Here in Louisville, the MLs move, and I mean MOVE! Pretty much the only figure you can count on seeing regularly is Weapon X. Even Deathlok and Bullseye steadily sell down.
Thanks for the offer of assistance. I need to decide if I'm sticking with the line, though. I haven't even opened the last couple of pieces I actually did find, and for me (a die-hard opener) that's a very bad sign.