GBA flashcart

I'm looking for a flashcart that works with GBA games and will work on a ds lite. I know that a ds flashcart doesn't support GBA games so I was wondering if you guys/girls have any advice for me. By the way it would be a nice touch if it could play either original gameboy/gameboy colour games as well, and around £25.Thanks in advance.

The EZFlash 3 in 1 will let you play GBA games.
http://www.dealextreme.com/details.dx/sku.2967You don't need a Slot 2 card to play GB and GBC games, just the Lameboy emulator for the DS.

is Lameboy a computer based emulator or does it run on a ds flashcart??

There is a version built for the DS.
http://www.linfoxdomain.com/nintendo/ds/dl.php/dsemu_Lameboy_DS_v0.12.zip
http://lameboy.nutki.com/

great help thank you, one last question though, when I read the readme it tells me to do this and I;m not sure what to do please advise. ( it says patch and I have lunar IPS patcher if that helps). Message:Patch Lameboy.nds file with proper flash driver. How do I get one? I'm using an R4 SDHC

You don't need to patch it. That is for DLDI patching. Most cards these days do that automatically.

I have put Lameboy.nds on to the root of my flashcard, where do i put the roms?
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when i turn my R4 on and go to Lameboy it has a black screen with white text and when i click on the lameboy folder it shows empty. Please advise.

Did you put any Gameboy or Gameboy color Roms on your card?

GBA but now I know it doesn't work. ;)