Not the greatest selection, but maybe someone will find something?
GBA E.T. The Extraterrestrial $4.90
http://shop3.outpost.com/product/3218451
X2 Wolverine's Revenge - GBA $4.90
http://shop3.outpost.com/product/3636615
Dark Arena GBA $4.90
http://shop3.outpost.com/product/3132000
Earthworm Jim 2 GBA $4.90
http://shop3.outpost.com/product/3330372
GBA MAT HOFFMAN'S BMX 2 $2.90
http://shop3.outpost.com/product/3319992
GBA Cruisin Velocity $4.90
http://shop3.outpost.com/product/3132170
GBA Rampage Puzzle Attack $4.90
http://shop3.outpost.com/product/3132110
The Wild Thornberrys - Gameboy Advance (GBA) $4.90
http://shop3.outpost.com/product/3095639
Bomberman MAX Advance Red GBA $4.90
http://shop3.outpost.com/product/3330352
Bomberman Max 2: Blue GBA $4.90
http://shop3.outpost.com/product/3330342
Moto GP - GBA $4.90
http://shop3.outpost.com/product/3241911
Rocket Power: Dream Scheme GBA $4.90
http://shop3.outpost.com/product/3095589
GBA NFL Blitz 2002 $4.90
http://shop3.outpost.com/product/3078299
WWF Road to Wrestlemania (GBA) $4.90
http://shop3.outpost.com/product/3150560
Shipping starts @ $4.83
copied from another site - thanks Jay
GBA E.T. The Extraterrestrial $4.90
http://shop3.outpost.com/product/3218451
X2 Wolverine's Revenge - GBA $4.90
http://shop3.outpost.com/product/3636615
Dark Arena GBA $4.90
http://shop3.outpost.com/product/3132000
Earthworm Jim 2 GBA $4.90
http://shop3.outpost.com/product/3330372
GBA MAT HOFFMAN'S BMX 2 $2.90
http://shop3.outpost.com/product/3319992
GBA Cruisin Velocity $4.90
http://shop3.outpost.com/product/3132170
GBA Rampage Puzzle Attack $4.90
http://shop3.outpost.com/product/3132110
The Wild Thornberrys - Gameboy Advance (GBA) $4.90
http://shop3.outpost.com/product/3095639
Bomberman MAX Advance Red GBA $4.90
http://shop3.outpost.com/product/3330352
Bomberman Max 2: Blue GBA $4.90
http://shop3.outpost.com/product/3330342
Moto GP - GBA $4.90
http://shop3.outpost.com/product/3241911
Rocket Power: Dream Scheme GBA $4.90
http://shop3.outpost.com/product/3095589
GBA NFL Blitz 2002 $4.90
http://shop3.outpost.com/product/3078299
WWF Road to Wrestlemania (GBA) $4.90
http://shop3.outpost.com/product/3150560
Shipping starts @ $4.83
copied from another site - thanks Jay