Pine64’s open-spec, Raspberry Pi sized “Pine H64 Model B” SBC has gone on sale for $39 (2GB) or $49 (3GB), with a quad -A53, 1.8GHz Allwinner H6 with GbE, WiFi/BT, HDMI 2.0, 3x USB, and RPi-style GPIO.
Source : Revised, Allwiner H64 based Pine H64 SBC has RPi size and GPIO