HP offers the HP Pavilion 560-p015hvr Intel Skylake Core i5 2.7GHz Desktop PC, model no. V9B22AA#ABA_PC, $749.99. Coupon code "HVR150" cuts the price to $599.99. With free shipping, that's $200 off list and the lowest total price we could find. Features include an Intel Core i5-6400 2.7GHz Skylake quad-core processor, 8GB RAM, 1TB hard drive with 128GB SSD, AMD Radeon RX 480 graphics, 802.11ac wireless, Bluetooth 4.2, and Windows 10 Home 64-bit.
Of note, HP doesn't specify whether this is the 4GB or 8GB GPU.