I have a great batch 5 antminer S3 performing stably at above 470GH (usually 473-478Gh), selling for 0.5BTC (NEW PRICE; current value ~$188), compared with Bitmain $219 w/coupon for only 453GH guaranteed. Shipping to continental US only, please do not give me lowball offers, price is fixed and could change very little and only if you want to pay for shipping.