The RetroNET Cloud CP/M operating system for the NABU PC.
In preparation for Luis' big news - there's an 80-column Cloud CPM BIOS for f18a in the NABU Channels. Also, for those with emulation, you can use this emulator with F18a 80-column mode support: https://cloud.nabu.ca/docs/MESS-NABU-9938.zip
I just re did my maths. I ordered 5 boards and 2 of the FPGA units and one set of the BOM from digikey and altogether with shipping it came to NZD200. That's significantly cheaper than what I paid for the 2 x f18a units I bought.