I would like to spend $15,000 or less. I am finding it a challenge to find out about what boats might be good options. And I haven't found many used boats for sale of the types I have listed. Is there a good source of information, and for used boats for sale for sailboats?
A lot of people would find this kind of 'challenge' enjoyable! Granted, it can be an incredible waste of time. And everyone has their own opions abou what you 'should' get. It's a buyers market right now for boats, especially in that price range. All the class associations for the boats that you have mentioned are listed here. Say you're interested in a used Etchells, try the Etchells site, etc. .
For example, and new racing model Etchells might cost more than $50,000 today. But you could find an older one that may not be a competive racer, but still in good condition for under $5000 EASY.
Probably the best place to find bargains in classes like this is at the local fleet level. So if there is one near you, thats where I would start. You just need to decide, do I want a Mustang, or do I want a Camaro.
Best of luck.