LAG has a bunch of Jerzy Drozds, MTDs, and generally a bunch of stuff by smaller boutique builders - generally a good mix of the high-end you really won't see anywhere else.
http://www.luthiersaccessgroup.com/bassesinstock.html
I was pretty much blown away by Mark's collection at Bass Club Chicago - Foderas, Laklands, Sadowsky, Manne, Tobias, and tons of other cool stuff.
Keep in mind that neither of the two shops are downtown - LAG is in the southwest suburbs and BCC is about 15 minutes straight south of Midway Airport.
I have an Eve of the Eve gig tomorrow night at Tryst in Wrigleyville about 2 blocks south of the ballpark with my trio. We play about 3 hours beginning at about 9pm. Expect to see a Pedulla, a Lonnybass, my MTD (possibly) and my Alembic/Stewart/Schroeder rig.
Lonnybass