The Banana Pi BPI-M2 Pro has is now purchasable globally for US$61. The compact SBC supports Android, multiple Linux distributions and has an HDMI 2.1 port, among other connections.
https://www.notebookcheck.net/Banana-Pi-BPI-M2-Pro-launches-globally-with-an-HDMI-2-1-connection-for-US-61.545833.0.html