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I do believe that the GBA LCD is reflective. You'd be best off putting the light in front of the screen rather than behind. This will keep the light from making the screen look washed out. You could also add a small rotary potentiometer to adjust the brightness. It looks like your current setup ...

When I did this project, I purchased the parts at my local Radio Shack (or The Source), both mentioned by Vort. If you do not have either store near you, a few good online suppliers of electronics are Sparkfun Electronics , Electronics Goldmine , and Digi-Key , though I'm not sure which stores ...