Interesting sale over at Bitmain: https://www.bitmaintech.com/productDetail.htm?pid=000201412171033028658LE40FU705ED
Although it would appear that AMHash is cheaper....
plus you have to pay for the electricity/hosting area once you have them
It looks like 1 year of hosting is included in their price, and the price of electricity is locked. You will be able to sell the miners at any time which can and will greatly affect your potential ROI verses this in which you do not actually own the miners