Re: Web Searching the Mac App Store

[David Sanson]

Try: 
macappstore://ax.search.itunes.apple.com/WebObjects/MZSearch.woa/wa/search?q=***

This should be added to the websearch plugin.

Source: 
http://www.macstories.net/tutorials/a-better-way-to-search-the-mac-app-store/