Any reason why you want usb miners? I have an old Nanofury NF1 2GH/s usb miner somewhere if you're interested. Problem is that these are so underpowered now it wont be worth having your pc on to run it, or even 100 of them.
I can sell you an S1 for 0.2 + postage and throw in the Nanofury for free if you want it.
S1 runs standard at 180GH/s. You will however need a minimum 450w / 500w quality psu to run it. Mine have been run off Corsair and Antec / Seasonic psu's which I've found are very reliable. You should be able to pick a used one from ebay for about £25 / £30.