Does anyone know where to get the Mac App Store Search API? I already know this site -> http://www.apple.com/itunes/affiliates/resources/documentation/itunes-store-web-service-search-api.html, and there's a great API to search the iOS App Store. The search results are returned in JSON format.
But where to get this for the Mac App Store?
That API will do what you need - try querying with entity macSoftware.
Here's an example that queries for Sparrow (the email client):
http://itunes.apple.com/search?entity=macSoftware&term=Sparrow