I am working on a app called Zcasher which is basically the us version of another app called Peerschweinchen (german) which comes first.
Both will allow to buy hashpower on the go for 24month. You can choose from a 1070 or 1080ti (400 or 700sol/s).
The offering is not unlimited. Whenever a spot is free, you will be informed by a push notification.
You get the payout minus a fee of 50% which covers colocation on a monthly scheme. Prices will vary but it is by now profitable within 24month.
I will keep you updated in this thread. My intention is to get zCash a bit more attention.