The CMM2 is being sold again in low volumes for $165.50 at https://www.rictech.nz/micromite-products
The PicoMite VGA was released about 3 years ago and the firmware has been continuously update, so many functions of the CMM2 are available on the much lower cost ($35). For more info, check out https://geoffg.net/picomitevga.html
The board designs are open source, so you can either order your own PCB and parts and build it yourself, or order a bare PCB from Tindie for $12 https://www.tindie.com/products/land_boards/raspberry-pi-pico-card-with-vga-sound-kbd-v3/