What is the cheapest vr headset for a gtx 1060

Sakkura

Distinguished
The Oculus Rift roomscale bundle has a standard price of $658, not 700+.

Amazon is going to offer $100 Oculus store credit with that bundle from the 11th to the 24th of June. The summer sale will likely start just after that, so you might be able to pick up a lot of good stuff that way.