When I lived in Chicago, I bought furniture and art from Susanin's Auctions. I would go so far as to say that it is my favorite auction house (until I start purchasing Klimt's from Christie's). Susanin's has amazing things, for surprising low prices.
Even though I live in LA, I still scroll through their auction catalogues and dream. Once I even compulsively bought a large piece of art and had to get UPS to wrap it up and ship it to me (probably lesson not learned).
FYI: Action catalogues show prices like this "300/500", meaning they estimate the lot will go for between $300 and $500, plus an additional buyers free of about 25% which goes to the auction house.
These are my top wants from their currently sale: