For a small budget
I think the best you will find is a broker that will do a quick YachtWorld search for you. Have you done that yourself? Yachtworld right now has the bulk of the market. No one can see more information in the ads than you can yourself. Brokers do have access to the sold listings that you can't get but that is about all.
You'll find that a broker on a deal like this isn't interested in looking to far away from his office. They are not going to go out and crawl around on them for you.
small/budget friendly blue water capable cruiser in the 30-36' range
You might need to get more specific on the budget
. It covers a lot of boat with not much money