Here some links to Craigslist cities or areas that are close to shipping ports. So maybe handy if you searching for cars and motorcycles.
Near Los Angeles:
http://losangeles.craigslist.org/
http://santabarbara.craigslist.org/
http://palmsprings.craigslist.org/
http://sandiego.craigslist.org/
Near New York:
http://longisland.craigslist.org/