Comment by asdff

>eBay and classifieds sites, I usually just want something in a rough ballpark, and the best way to find that is come back and check every day looking through searches.

You already can do that on ebay. Whatever terms get you ballpark results can become a search alert. You don't need to know the items you want exactly. And you get a handy email with the results of that alert when they hit, which you can scroll over in about ten seconds.