Who Knows About "Web Search Crawler/Bots/Finders"?

[sqidd]

I've seen it mentioned that some people have or use some sort of web crawling software or maybe web site that you can use to constantly scour the net for items to become available.

I've got a wish list of toys that I'm constantly on the lookout for and sometimes I spend WAY too much time searching for. I'll hit the usual places like AmiAmi, Jungle, Mandrake, feeBay, etc. I don't know of any others to search.

Is there software or a service that will "crawl" the web looking for things to become available for sale?

Thanks!