Since the original GBA ROMs repo has been down for a bit now I figured I would check around to see if there were any others around. I did come across one, it is very new and only has a handful of games right now, but more games are continuously being added.
So if you decide to add this source make sure you keep checking for updates.
The repo is: pinguino360.googlepages.com/pggbaroms.xml
Make sure to keep the http://
Let me know how it works out. I have installed this as of 10 minutes ago, so right now it is up and running.
REPO STATUS: OFFLINE