3dscapture.com

it's a little hard for me to tell from the image, but if it's just the circle pad connector that's broken and everything else is in working order i would think u could sell for at least $100 USD or so--the capture board itself from optimize costs around that much anyway with shipping

even if the ...

That product seems to just be a cartridge dumper with a nice interface, it's still using emulation to play the games. A DS flashcart can also dump games and saves from the GBA slot of a DS or DS Lite, and the newer unbranded ones are around $10.

There's a few other options for high-fidelity GBA ...

The only board Loopy has produced as of now is for the original 3DS, non-XL. Optimize produces the boards for most other models right now, so you'll need their software here: http://non-standard.com/ols/n3DSview_ver701_r6.zip