Google: site:craigslist.org raleigh folding
Alternately, if you regularly search the same few areas of Craigslist and plan on doing the same search repeatedly over a length of time (days, weeks, months), use a RSS feed reader or a browser that supports RSS bookmarks (Firefox does this).
As an example, use firefox to go to newyork.craigslist.org. Go to the For Sale/Wanted page on bikes, and do a search for "raleigh". The results will come up, but you're not interested in them at the moment. In the address bar, to the right will be an orange RSS icon. Click on this, and name the bookmark anything you want.... a good name would be "NYC Raleigh". Choose "OK", and then look in your bookmarks folder. You now have an RSS feed for all of the NYC bicycle ads that feature the word "raleigh", with links to the relevent ads. You can even organize your bookmarks into a folder file structure, so (for example) I have "Craigslist\bikes\folders\NYC". You can quickly browse through the categories and cities on a daily or weekly basis, and only visit those ads that look interesting to you.
Cheers if this is helpful, and sorry for the OT discussion.