Yes, both AMZ Watcher and Oh Link offer a Free Trial.
AMZ Watcher is designed for Large Enterprises, Medium Business and Small Business.
Oh Link is designed for Large Enterprises, Medium Business and Small Business.
Pricing for AMZ Watcher Starts at $16.63/Month when Billed Yearly whereas for Oh Link Starts at $4.17/Month when Billed Yearly.
Some top alternatives to AMZ Watcher includes Monitor Backlinks, AMZ Alert, Qualified, SwitchURLs, Workvivo, Oh Link, Amplify.link, Observa, Traxr, share.link, IFTTT and AmznHawk.
Some top alternatives to Oh Link includes AffTrack, Affiliatise, Affiliatics, Tapfiliate, Sir Filiate, Trackdesk, Qualified, EnactSoft AffiliateTrack, Workvivo, AffSync, AmznHawk and AMZ Watcher.