Where is the best place to buy a gameboy advance flash Card ?

[pugmagician]

Originally posted by rav96
there is also a GB bridger that allows you to use GB/GBC carts on GBA systems. (just thought i'd add that bit)

Yes, it has to be a relitivly new device. However it's not used for GB/GBC flash carts/cards (whichever you choose to call it), it is used for GBA Flash Carts. The purpose of it is to allow you to put GB/GBC roms on a GBA Flash cart and be able to use them on any system. Normally you wouldn't be able to play GBC/GB roms off the GBA Flash carts.