Are you sure someone would sell you Bitfury full kit for BTC50?
Maybe in December, but now?
Your prices are not attractive. Most miners would just mine all the way to the end, not sell you at these prices.
Single at 7, that is 56 for a mini rig. It makes 2/day right now. I think you'll recover more than 56 from a mini.
So keep dropping your "wishful thinking" prices, I don't think you'll be buying much.