From Bay Prospector:
Prospector Lite is an advanced search tool and auction sniper for eBay, that makes it easy to track and find bargains that you are interested in. You can create detailed search queries, using keywords, exclusions, and other filters, even with support fro regular expressions. The searches can be saved and organized into custom categories, so that you can easily refer to them later, using the latest eBay results. Additional features include customizable results layout, automatic searches with email notification, built-in auction sniping and more. Note: The Lite version is limited to 30 searches a day, and 15 snipes a month.