on usa ebay some are selling as low as 289 usd. shipping on monday from a legit seller. if you are like me and get a bonus back ( I get 4% ) it is only 277 .44 usd
here are some low ebay sellers
http://www.ebay.com/itm/BITMAIN-Antminer-S1-180GH-IN-HAND-USA-Seller-Bitcoin-BTC-Miner-New-and-Cheap-/271508420964?pt=US_Virtual_Currency&hash=item3f3729b964
http://www.ebay.com/itm/BITMAIN-S1-180GH-IN-HAND-AntMiner-USA-Seller-Bitcoin-BTC-Miner-New-and-Cheap/141304175331?
I have two extra brand new S1, send PM. See https://bitcointalksearch.org/topic/wts-two-antminer-s1-us-unopened-from-bitmain-634036