MangoPi Allwinner H616 based SBC available for ~$27US
The Allwinner H616 is a quad-core ARM Cortex-A53 processor with a maximum frequency of 1.5GHz. The System on Chip (SoC) also integrates the ARM Mali-T720 GPU which is compatible with OpenGL ES1.0/2.0/3.2, Vulkan 1.1 and OpenCL 2.0
The MQ-Quad comes with up to 1GB of DDR3L RAM and it also offers a Micro SD Card slot located on top of the board.
For wireless connectivity, the device is enabled with the RTL8723DS module to support Bluetooth 4.2 as well as 802.11BGN Wi-Fi 4. The display interface consists of a mini HDMI 2.0a port with [email protected] resolution.