Newegg.com has Intel NUC Skull Canyon NUC6i7KYK Mini Barebones Kit on sale for $599.99. Shipping is free.
Includes
Intel NUC6i7KYK barebone w/6th Gen Intel Core i7-6770HQ Quad-Core Processor (2.6GHz up to 3.5GHz) w/ Intel Iris Pro Graphics
256GB Intel SSD 600p Series M.2 (80mm)
8GB Team DDR4 SO-DIMM Memory