Yes, both Offer18 and Post Affiliate Pro offer a Free Trial.
Offer18 is designed for Large Enterprises, Medium Business and Small Business.
Post Affiliate Pro is designed for Large Enterprises, Medium Business and Small Business.
Pricing for Offer18 Starts at $49/Month whereas for Post Affiliate Pro Starts at $129/Month.
Some top alternatives to Offer18 includes AffTrack, Post Affiliate Pro, TrackingDesk, Refersion, Affiliatise, TUNE, OffersHub, Affiliatics, Evotrack and Trackdesk.
Some top alternatives to Post Affiliate Pro includes Affise, AffTrack, TrackingDesk, Refersion, Affiliatise, TUNE, OffersHub, Affilo, Promocate and Affiliatics.