If you are looking for a discount on the Lumia 950 XL, Expansys USA has a nice deal. The retailer is currently selling the single SIM unlocked Lumia 950 XL for just $564.99, or about $80 off its normal price. The phone is available in both black and white.
This is a solid discount for the 5.7-inch Windows 10 Mobile flagship smartphone. Keep in mind that the phone will only work with a limited number of carriers in the US, including T-Mobile and AT&T.