Just go to flying Scot.com. That's the factory website. Unlike most of the boats on here, flying Scots are still being made with about one a week coming out last time I talked to them. I own two currently and have had a bunch more and through them have had to buy nearly every part.
If you are going to buy one, be sure to get the rudder lift as it really helps you when launching and pulling the boat out. A tiller tender is nice as well.