For New England and based on the condition it would be priced more around $300-$400. Pricing sometimes depends on location. Sunfish come up regularly for sale here in NE so prices may be a bit lower than other areas.
I agree with the previous poster that this boat is overpriced. It's quite old and has the old rudder set up, which is a disadvantage. Note that the pictures don't tell whether the hull has taken on water...
OVERPRICED! Even for this area that's too much. I've seen them pretty frequent in the Tampa Bay Area listed for $500 and under. There's a very similar boat listed on CL for $399 and includes trailer, just for example. http://sarasota.craigslist.org/boa/3532123193.html