Scottymate,
I would be jumping on the Sailormat on Ebay at the moment, item number
320416562741.
Failing that make your own. I have one almost completed now made from mostly ss tube and plate, I have plenty of scrap laying around. Probably spent $20 so far. Based on a Walt Murray design. There is a good forum dedicated to windvane self steering;
cruisenews.netI'm Ramona on that one as well. Not expensive to make but very time consuming.