At that price I would be interested in buying at least 8 MB, possibly all 16. Got a 3000 with NO fAST RAM at all, and it's kinda useless like that :-(
Accelerators for it are, apparently, made of gold so I can't afford to go that route. I've also got a GBA1000 board but it'll be a long time before that works. So it'd be cool to get the 3000 going for my retro needs :-)