For some godforsaken reason Craigslist makes it really difficult to do a broad search of the entire country, or multiple regions of the country. There are some search engines that will require some modified security settings in your browser that I’ve tried, but don’t really cut it. Search All Junk, though, uses Google Custom Search to hit “Craigslist, Recycler, Penny Saver, Oodle and more!”
Here it is… hours and hours of internetz fun! Search All Junk.