Sorry but you hardly going to mine either.  If bought by CC what prevents you from mining for a month and returning back to vendor for refund and repeat the cycle?  Unfortunately because of fast raising difficulty, this pre-order phenomenon created.  Right now you can buy BFL 10 GHS miner from Walmart but that wont do jack in terms of mining and literally obsolete. But you can return it back in less than two weeks.

Here is one: http://www.walmart.com/ip/Butterfly-Labs-Bitcoin-Miner-10-GH-S-Processor-USB-2.0-BF0010G/34952957

However finding trusted mining manufacture who actually fund their engineering team to develop a miner is hard, unlike the BFL clowns pocketing 99% of funds and allocate less than 1% to development.  That is why it takes eons for them to build anything, and that is called stealing.  But they dont care, you are talking about $100 Millions here.