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PriceFalls

Modeled after a traditional Dutch auction, this sell-/buy-anything service reverses eBay by letting sellers choose a price ceiling (the max they hope someone'll pay), then set a gradual price decrease at 1-7 day intervals until it reaches their selected "price floor"; buyers can nab items on the spot, or get email alerts on any lower "If It Hits" price they set, although that's pretty much guaranteed when purchasing Naomi Campbell.