Based on the specs, I believe it is the EVGA 06G-P4-6163-KR card. I believe retail price is $270 at the moment. There is tax, but shipping should be free.
https://www.microsoft.c
Next cheapest price appears to be at Newegg for $290.
I personally bought the PNY GTX 1070 a few weeks back when it was $400 on microsoftstore.com using Xbox Gift cards. It is now $450.
From Eagles89 – YMMV – $206 if you are eligible for educational discount