Yes, both PayWhirl and Post Affiliate Pro offer a Free Trial.
PayWhirl is designed for Large Enterprises, Medium Business and Small Business.
Post Affiliate Pro is designed for Large Enterprises, Medium Business and Small Business.
The starting price of Post Affiliate Pro begins at $129/Month, while pricing details for PayWhirl are unavailable.
Some top alternatives to PayWhirl includes Chargebee, OneBill, billwerk, Servicebot, Subill, Billsby, Rerun, ReCharge, Recurly and Subscribie.
Some top alternatives to Post Affiliate Pro includes Affise, AffTrack, TrackingDesk, Refersion, Affiliatise, TUNE, OffersHub, Affilo, Promocate and Affiliatics.