CraigLook is a good site to search for ads from Craigslist.Org. It does a few things that Google site: command doesn’t do.
It shows a picture of the product, it doesn’t show ads that have been removed by the seller after the product is sold, you can sort by date or price, and the format is a bit neater than Google’s SERPs.
Here is a search for Wax Melter from CraigLook.
Here is an example of how you do a global search of Craigslist.Org on Google for Wax Melter.