It looks like they've got a $20 US discount on the box today. I think it may require Prime Membership? I don't remember becoming a Prime member, but it shows $179.99 for me, so I'm not sure if you need that or not.
"This is a Prime Day only deal, which means it'll expire at 11:59 p.m (PT) today. There won't be unlimited stock, either, so I'd get in quick if you don't want to miss out."
http://www.androidpolice.com/2017/07/11/deal-alert-nvidias-s...