Before mining, prices on the 1080 tanked because If it made sense to push budget up from 1070 to 1080, it was an even easier decision to go from 1080 to 1080 Ti.... so peeps have been ignoring the 1080 and with supply high, prices have stayed low making it the new best bang for the buck in many instances. her's one with $150 worth of EK Water block and backplate for $550
https
/www.newegg.com/Product/Product.aspx?Item=N82E16814127952
Unfortunately, for the 1070 ... for the models most folks want (Gigabyte G1 / MSI Gaming X) ... supply is low and therefore prices are high