There is also Filene's Basement on 6/20th, DSW on USquare, Daffys on Bway/Grand. None of these can even hold a candle to Century21 though. There is also INA and Fisch for the Hip for designer consignment.
Love INA!!!! There is one on Prince between Elizabeth and Mott Street (a few doors down from Cafe Havana) I saw a couple balenciaga's at this location recently. They looked almost MINT condition. I have had a lot of luck in this store as well.