Basics on App Store Scraping

Could anyone point me in the right direction for downloading app store statistics from:

-the Apple App Store -The Android Market -the Amazon AppStore

Specifically, I’d like to get the

-average selling price of apps -the top selling apps -the distribution of tablets vs. phones, etc. -total number of apps in store -free vs. paid apps

I’ve seen some sites like [url]http://148apps.biz/app-store-metrics/[/url]

and [url]http://www.appbrain.com/stats/[/url]

How do these sites get their data? There must be a way to export the whole app store database as a CSV file, or import it to MySQL and run queries.

Thanks much for any direction.

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