Amazon.com has Intel NUC Barebone Kit (NUC5i5RYK) for $289.99. You can read our review on the Intel NUC Kit NUC5i5RYK here.
5th Gen Intel Core i5-5250U Processor (Broadwell)
Supports Dual-Channel DDR3L 1600/1333 (1.35V), 16GB Max (Sold Separately)
Internal Support for M.2 SSD card (22x42, 22x60, or 22x80)
Intel 10/100/1000 Mbps Network Connection
19V, 65 W wall mount AC-DC Power Adapter