I don't know of anywhere these days that carries Game Doctor formatted ROMs. It would be nice if there was such a place. If anyone wants to start one that would be great! Currently you have to backup your games yourself or convert SMC format ROMs to Game Doctor format which seems to be somewhat of an art.
You are aware the SF7 has a parallel port for loading games too? It's much more convenient than the floppy for loading, that's for sure, although the only xfer program I ever got to work with it was GTool and now that I've upgraded to a new faster PC that seems to break as well. I'm looking into whether I can fix an xfer program to work with it.