http://www.techwench.com/amazons-android-appstore-getting-ready/
The upcoming Amazon Appstore is revolutionary in that it invites programmers from around the globe to propose Android applications for sale through the site. Amazon will be different from the other App-stores in the pricing system as well. Even when the developer can set the list price, it is Amazon who will set the actual application price and a royalty will be paid to the developer. The royalty payment is in accordance to Amazon’s developer license agreement.