If you haven't heard
https://bitcointalk.org/index.php?topic=656461.0S3's are just about to be released any day for 504GH for 390 Watts
which is 0.77 Watt/GH.
This should crash s1's market price considerably.
If you are trying to sell your s1's in a hurry before these are released within a few days.
I am willing to buy Antminer s1's off you for 0.15 BTC each.