Just found this. I know other here are posted but none take sd cards or roms. This is the first one I've seen that does. And also plays mp3s and mp4s and wma. Too bad it doesn't day gba only color and b/w. And it doesn't mention game genie. But still lworth looking into.
I did post it one here but it got wiped off during the big cock-up.
It is not a official Nintendo hand held nor do they have anything to do with it
(Its also over two years out of date)