I tracked one down at a GameStop (apparently they don't really carry it beyond what's left on-hand) for $10, and tried to use my SF anniversary controller... AWFUL. I can normally throw fireballs as consistently as hitting the kick button, but couldn't throw more than one in five or six attempts. Lots of lag. (plugged it back into the PS2 to make sure it wasn't the controller, and worked very nicely with VF4Evo).
There are a number of types sitting out there on import sites, has anyone ordered one from Lik-Sang or Play-Asia?
btw, thanks for the posts!