CoCo SDC $50.00
http://cocosdc.blogspot.com/
Switch-a-roo $40.00
https://cocomanbiz.wordpress.com/
CiBest HDMI to SCART Converter-Composite Video Stereo Audio Adapter $36.99
https://www.amazon.com/gp/product/B06Y43RVLH
Boomerang E2 2048kB SRAM with CPU Guardian+ board $49.00
https://boysontech.com/marketplace/
Mini-MPI $80.00
https://sites.google.com/site/thezippsterzone/mini-mpi