Yes I do sell the PCB's but you'll need to go to the For Sale page, I don't link from the individual board pages :
http://www.theoddys.com/acorn/replic...mer_board.html
The PROMER program will not run on a System 1, it needs a VDU, Keyboard etc. so you need at least a System 2 and really a disk based System 3 as I wouldn't want to load it from tape !