All GPU's are now priced by retailers relative to the hash rate they generate they want a slice of the action maybe they should find a corner of the warehouse and dedicate it as mining area or named "GPU performance testing zone"

Back to the question, your asking for free money when you ask for cheap GPU deals so its very unlikely you will find them and if you do be careful because gifts like that..... For those who pay domestic electric rates ROI is currently 10 months and may go up or down as the price of the market fluctuates. For me i can do better as i use my rig to heat the house so can get that ROI down a few months with that saving but also bear in mind the switch to ETH2 looms however I anticipate miners will switch to other alts and therefore ETC may have a post ETH2 mega pump... but i dont know much at all this is just wind and its up to you to decide when to raise your sail.