During April 2024 bare printed circuit boards in the “Pick’n’Mix Boards for RCBus/RC2014” range are available from Tindie with a 35% discount.
https://www.tindie.com/products/15196/

Also the “SC132 Z80 SIO/0 Module Kit for RC2014” is available from Tindie with a 35% discount.
https://www.tindie.com/products/19556/