GBA ROMs are generally in filename.gba format. (Most emulators allow you to keep them zipped to save space, which is good, as a complete zipped collection is still a couple of gigs.)
See if your local news feed carries the alt.binaries.emulators.* hierarchy, with a.b.e.gameboy.advance being your most likely target in this case. Several systems have their own newsgroups, and a.b.e.misc is the home for the rest.
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