And a 1080 @ $440 is still > a 1070 @ $400. You asked the question, I answered. The deal isn't good when those options go in and out of stock. Again, turn on auto-notify.
Just in case any new miners are looking at this, 1080 mining rates are slower then 1070. For gaming, yeah go for 1080 for sure, but for mining, better off with the 1070.