So the smallest miner costs $274 and has a 5 GH/s hash rate at 30 W. I plugged those numbers into a mining calculator and found it would generate 0.3 BTC per day. At current market price, that would be $260 a week. Not bad really. I would like to buy 2 or 3 of them... except by the time they are delivered, the hash rate will be 10 times higher.