The German site PlaystationPortable.de had the chance to talk with Sony about the upcoming App Store and the PSP minis series. They didn't want to reveal their exact pricing yet. But it was told that the games will be very affordable and comparable to the competition.
Unlike the Apple App store the focus will be on quality rather than quantity. Until the end of 2009 Sony wants to release a maximum of 50 titles of the PSP minis series, on a weekly basis.
Further information can be found in the source.