Let me filter and alert based on a distance, not just sort. e.g. "Lathe" within 100 miles of Baltimore. GovDeals lets you do this, but their distance filter is very inaccurate.
Not clear where to enter the ZIP code, though. The landing page lets you select a State, but no input field for anything more narrow than that. Cool site though, I could get into it, since I love estate sales and other places to get cheap junk.