This has now been extended to the Amazon App Store. They don't seem to have a page for it yet, so here are the ones available at Amazon.
Link to List of 25 cent apps at Google Play
For All Tablets and Kindle Fire
The Cat in the Hat (All)
Office suite Pro 6 (All)
Clouds and Sheep Premium (All)
Let's Create Pottery (All)
Sudoku (All)
Symphony of Eternity (All)
Tablets/Phones Only - Not Available for Kindle Fire
Angry Birds Space (not available for Kindle)
runtastic Pro (not available for Kindle)
Kindle Fire Only
Asphalt Heat: Kindle Fire Edition (Kindle Only)
Draw Something: Kindle Fire Edition (Kindle Fire only)
Unavailable
Ocean HD
Granny Smith
NFL Kicker 13
Tasks
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http://seperis.livejournal.com/952058.html