Unless you are auction addict and interested in participating in one more than in actually buying the boat, there are several more options for buying a used inexpensive boat. My favorite is
www.Craigslist.org . You can search it locally or expend your search to the adjacent areas within your driving range. Find your state and region on the main page, choose "for sale> boats" from the drop-down menu and enter your search criteria, for example "12 aluminum". Sometimes boats are sold with trailers, oars, motors, PFDs and other useful stuff. Prices are lower at winter time and go up in the beginning of the season.
Good luck!