Massdrop has the MSI Gaming X GeForce GTX 1080 8 Gb for $499 + Destiny 2 (PCDD) + $25 Rebate. Shipping is free.
Note, must be logged in to see the price. Each drop participant will receive a copy of Destiny 2 for PC (game code digitally provided).
Not a bad price for crypto mining zcash or for those who don't want to spend on the TI. The Gamin X cards usually overclock really well.
No sales tax outside of California and New Jersey.