if you are anywhere near the Dallas/Fort Worth area in Texas and in need of Sunfish parts, there is a craigslist posting by the Dallas Corinthian Yacht Club where they are selling a TON of Sunfish parts. apparently they are no longer going to be using the Sunfish for their youth program, and are thus selling off the whole lot of them. posting says this weekend only, so jump on it if you are in that area.
the hulls look to all be older and are pretty beat up, but $150 to $200 range.
sails on booms ($175) or loose sails ($25 to $50)
daggerboards and rudders ($75 each)
the craigslist post has a lot more details. I’m not sure this is your best option if you’re starting with nothing – but if you’re looking for a spare part or two, it’s probably well worth your time.