guitars?
If you're here for a few weeks then I'd recommend Mike's too for vintage
http://www.mikesmusicohio.com/ - it's in Coryville by UC, not the greatest area. Also Fretware up North on I-75 in Franklin
http://www.fretware.cc/ - only open on Saturday - for vintage archtops. And if you're looking for new stuff First Quality Music Supplies in Louisville, not too far
http://www.fqms.com/
For pro recording gear - nothing around here I know of.