You can sometimes pick up a nice one on Ebay, but this guy is the king... and I think his prices are quite reasonable. He mostly does Federals but he may have a sea mite around too.
1964 36'Challenger 'Vanora'
1965 21'Supersport 'Mary Elizabeth'
1946 18' Atkin ketch 'Dove'
1952 14' Peterborough 'Ruby'
1922 8' Gregory 'Miz Samson'
Large piles of wood, tools, motors and other very very valuable stuff