There are currently 2 USB powered mining devices that I know of. ASICMINER Block Erupter USB (https://bitcointalksearch.org/topic/announcement-block-erupter-usb-195004) and
Avalon Asic chip Mini USB miner (https://bitcointalksearch.org/topic/m.2040708). The ASICMINER USB is currently in production, while the Avalon USB is still in design. Check out the Custom hardware forum (https://bitcointalk.org/index.php?board=76.0) to join group buys to purchase units. You should always read all the terms of the group buy before committing to an order.
Avalon Asic chip Mini USB miner (https://bitcointalksearch.org/topic/m.2040708). The ASICMINER USB is currently in production, while the Avalon USB is still in design. Check out the Custom hardware forum (https://bitcointalk.org/index.php?board=76.0) to join group buys to purchase units. You should always read all the terms of the group buy before committing to an order.
>300MH/s powered by your 500mA(2.5W) USB power. Cost 1.99BTC each with a min. order of 300 from ASICMINER. You need at lease 597BTC to order from them. Your best bet is to try the group buys.
Happy mining,
QG
