404 Page Not Found – Craigslist Search Engine by State
I once wrote a Perl script for crawling Craigslist for a particular product. It could be used for localized results, but the real benefit is price comparison capabilities (price arbitrage) by having global results for reference. It is very useful for some products, especially collectibles.
I once used it to buy a rare guitar I was wanting. Average prices in the US were in the range of $4000 USD. Funny then that the same guitar was priced at 4000 pounds in the UK. That was a nice 60% premium at the time and a very nice way to pay for a flight I thought.
Well the point is, I took the script down because its not the focus of this site. If you were looking for custom search / crawling capabilities, you can contact me.