Used Optimist Sailboat And Canada Anybody Know Where I Can Buy A Small Sailboat (ex. Sunfish, Snark, Optimist, Etc.) For Cheap?

Anybody know where I can buy a small sailboat (ex. sunfish, snark, optimist, etc.) for cheap? - used optimist sailboat and canada

I am looking for a small boat for use at sea (freshwater only), but at a lower price. I will buy it online, but a store near Boston, Massachusetts would be much more convenient.