It's a real bummer that the Nexus 6 has been so hard to find, but supply is starting to catch up to demand. T-Mobile has enough in stock to be offering a nice little Cyber Monday deal. The Nexus 6 is $50 off if you buy it today.
T-Mobile doesn't apply any weird branding to the device like AT&T does, and it's SIM unlocked. The carrier only offers the blue Nexus 6, though.
[Deal Alert] T-Mobile Is Knocking $48 Off The Price Of The Nexus 6 ($601.99 32GB And $651.99 64GB) For Cyber Monday was written by the awesome team at Android Police.