I just ordered this, the deal is legit.
It's the ZOTAC Gaming RTX 2080 AMP for $660. Free expedited shipping, no tax outside of NY it seems; at least I ordered from PA and paid no tax.
You have to read this and go through that link.
I had to put this in my cart twice to see the discounted...
http://rog.asus.com/158612012/graphics-cards-2/asus-geforce-gtx-660-ti-bios-drop-inbound-for-performance/
Promises a few percentage points of 3dmark performance. I'm tempted to try the TOP BIOS on my Standard card to get a higher base clock.. I can manually reach the TOPs speed no problem but...