Craigs list

try sitemash

http://www.jaxed.com/cgi-bin/mash.cgi?itm=&cat=cp&fil=&pg=&state=&ys=&ye=

To search all of craigslist I use a google search. for example enter the following into a google search box:
1950 hudson site:craigslist.org
and then scour through lots of expired posts, and even search the town shown in the expired ad to look for reposts. Lots of work.

Or searchtempest.com