SimplyTickling and RandomSoleEncounters are two stores that I think fall into this category. The best to ever do it in my opinion was TickleTown, but sadly that store is no longer up, and the clips unless they're floating around on Pornhub or something, are gone for good. Also eventhough TickleChallenge doesn't appear to be making clips anymore, his store is still up, and a lot of his stuff is amateur girls.
Vids with amateur girls have become a favorite of mine as well. Like I love scenarios where girls are approached on the street, where they respond to ads, and where a professional model introduces a amateur friend to the fetish industry. They weren't tickling-related, but I've actually gotten a couple customs done where professionals act like amateur girls. Obviously it's not the same, but it's indeed my favorite scenario and the clips came out great.