You don't need a special search engine to sift through every craigslist site. Just add "site:craigslist.org" at the end of your search phrase and your everyday search engine will search 'em all. For example, try this to search for "delmonico tv"
delmonico tv site:craigslist.org
I know this works with Bing, Google, and Yahoo. Haven't tried other engines.
By specifying a different name after "site:" you can search any other domain name. For example, this will find old VideoKarma discussions that mention the RCA CT-100:
CT-100 site:videokarma.org
Regards,
Phil Nelson
Phil's Old Radios
http://antiqueradio.org/index.html