R4DS for slot-2?

Dear /games/,
What is the best  cartridge for Nintendo DS to emulate/run games for GBA (and be used as a memory expansion for Opera Mini)? I mean something like R4DS but for slot-2...

Also, does it use SD cards?

btw, why /v/ gives always "Abnormal reply" when I try to post?

3 in 1 pack + R4DS = win
you can put GBA roms on your r4 cartridge and load games off of it that run from the 3 in 1
http://www.dealextreme.com/details.dx/sku.2967