I have for sale a Gridseed G-Black Scrypt miner. The unit is rated 23-25 Mh/s but I consistently get ~26.5 Mh/s with no overclock (chips @ 800 MHz). It draws about 450-500 watts from the wall.
Power supply and Raspberry Pi control board are included. The miner is running the Minera operating system (more info
here) on a microsd card which I will include along with the Raspberry Pi.
Asking price is 0.60 BTC plus shipping. I prefer to ship to the USA and I will charge a flat $35 shipping cost (converted to BTC for payment) to anywhere in the Domestic US. If you're international and still want to buy the miner send me a pm and we can work out additional shipping charges. I prefer not to use escrow as its simpler and I've done a number of deals on these forums without it. However I understand if a buyer insists on escrow, so I will accept it. All escrow fees will be paid by the buyer and it will be his/her responsibility to find a reputable escrow agent.
Here is a screenshot of the Minera dashboard:
https://i.imgur.com/xvqWaD5.pngThe hashrate at the top is what the pool is reporting (26.61 mh/s) and the hashrate at the bottom of the screen is what the miner itself is reporting (26.94 mh/s). Error rates are consistently below 0.4% overall for the miner although there are 10 circuits and one of the 10 always seems to be a little higher (1.81% error rate shown in the screenshot). Miner uptime in the picture is about 5 days. I typically restart the miner once a week just for the hell of it, although I probably don't need to. The Minera OS will automatically restart the miner if it stops mining for any reason.
And here are a couple pictures of the miner itself (front and back)
https://i.imgur.com/OHYMXSh.jpg?1https://i.imgur.com/uFHB5mi.jpg?1