Hulls/$50:
https://sandiego.craigslist.org/csd/bpo/d/san-diego-16-prindle-hulls/7776411606.html

Complete boat with trailer/free (I would, but my wife would kill me in my sleep):
https://offerup.com/item/detail/e5d3e002-73a6-381f-9ec4-79a23954b8b7?q=catamaran