I finally got a DS (MarioKart edition) and I'm looking for suggestions on how to fill the GBA slot. What I want is added functionality or fun for hopefully under $100. Here are some suggestions to get the ball rolling--keep in mind that I never owned a GBA so I don't have any GBA games.
DS rumble pak (seems kind of pointless if you ask me, but cheap)
Play Yan micro (I already have an ipod, so this might not be my best option either)
flash cart (I can play GBA, SNES etc. roms on one of these, right? How?)
GBA game (suggestions...)
I really want something that doesn't stick out much more than a GBA game would. I would really like some sort of a flash cart, but not some big, bulky, $200 behemoth. Can you see my dillema? Thanks.