I haven't seen this posted anywhere, but this seems like the best price I've seen on it (unless you were one of the lucky ten people to actually get one through dvdsoon.com). Anyways, here's the link:
Edit: includes GC/GBA cable
http://www.ebgames.com/ebx/product/242692.asp
Edit: includes GC/GBA cable
http://www.ebgames.com/ebx/product/242692.asp