There are couple oddity music stores downtown like...
Wedgles Music & Loan, 1122 Broadway, Downtown. The staff seems helpful, sorta knowledgeable with basses and very knowledgeable of six-string guitars. They seem to maintain a rotating selection of used string instruments from the entry level, to vintage and to the top-end. They sell most of their inventory on Ebay.
Music Gear Guys, 220 S Broadway, Downtown.Music Gear Guys - home page I bought an '84 USA BC RICH Mockingbird there, I found it stashed behind a Tama drum set wedged between guitar cases. The owner Gregory enjoys hiding the gems in his store alike an Easter egg hunt deal. If the item stays hidden for too long it goes on display or Ebay.
Wedgles always has some cool used gear. Right now they have a couple Rics, a 70s Fender Musicmaster and some funky custom hollowbody. Some of their prices are on the high side, but sometimes they have some real gems and they don't know what they have. Go in about a half hour before close and you can talk them down as their locking up.
Music Gear Guys carries Eastwood basses. I think they're pretty cool but maybe not your taste. The owner is a really nice guy. He's got a crappy old Washburn that he installed a Mutron onboard. It's super cool to play and tweak the knob as you go