I just added a 230+ MH/s groestl rig to miningrentals only for 60mBTC/day (0.261mBTC/MHASH/day). https://www.miningrigrentals.com/rigs/6284/. It is less than your gpus power cost.
I'll take it if you can give the specs and send a photo, there is nothing on the MRR site.
You rented this rig? Is it working OK? I wanted to take it but five minutes before my payment arrived to MiningRentals that rig has been rented already. :-)