Best Ad Network for Amazon App Store

Hey guys,

I have been out of the Android business for a couple of years, used to make good money with airpush back then. I am interested in testing 3rd party android app stores, starting with amazon and I am interested in knowing wich are the best ad networks to use with them.

I know airpush supports amazon app store but I want to know which are the others that support it.

Looking forward for your replies.

Best Regards