GBA flash carts

I'd like to get a flash cart for my GBA (old version), but I don't really know what to get.

* Any good brands/models I should look out for ? I'm not looking for lots of space - enough for a few games, but I would like one that's cheap & reliable.

* Are there any reputable online resellers that deliver in Europe, or can I get these things in regular stores ?

* Since the DS will be reverse-compatible, will a GBA flash cart work on it too ?

Thanks

Try Flash2advance. I hear that it is the best. You could also try EZ flash

Damn, those are more expensive then I thought.

I guess it'll be a 128 then - maybe when the Xmas money comes through.

Any chance of finding these in games/electronics stores ?