I have build the OpenTherm gateway. With succes
So now I have PCB boards left-over. It is the 'standard' green PCB.In the Netherlands the price is: EUR 5,50 including shipping. For other countries please PM me.
It is the same board as on this site: http://www.tclcode.com/opentherm/schematic.html#layout
Please go to http://www.tclcode.com/opentherm/pcb.html to get a board.
Michel.
Update: All boards are sold!