Cheapest Kaby Lake barebone

HABEY BIS-6862-I3 features Intel's 15W i3-7100U (3845 Average CPU Mark), two SO-DIMM slots (DDR4 2133/1600 MHz, up to 32GB), two M.2 slots, HDMI, DisplayPort, four USB 2.0, two USB 3.0, and two GbE ports. The slim barebone (191 x 151 x 27 mm) is available for only $320. HABEY (aka NORCO) is a major player in the global industrial market for more than a decade.

Source: Amazon

Update: Shuttle's DS77U (Celeron 3865U) is actually the cheapest Kaby Lake barebone.