The Stock Exchange is a market where customers actually want the prices to go down, not up. That's because it is a consignment shop, where a wide selection of what the staff calls "practical items" are marked down 15 percent every 30 days, for up to four months. The shop's offerings fill three floors, including a bargain basement where the greatest deals can be found for any number of eclectic pieces: furniture, tableware, figurines and books, to name just a few. The upper floors have the newer arrivals, and the savvy shopper just might find the perfect antique or collectible for the home at a fantastic price.