Tickle abuse isn't fake.
Tickling paradise isn't always, either. Just scripted fairly badly. Some of the old stuff is pretty good. There's an amazing clip floating around of Summer getting her feet licked by a dog. Really, really good.
Rook's media is alright stuff.
Zen tickling has some good clips. Amber's feet is one of the best out there.
French tickling is always good as is Czech tickling.
Gemini's tickling store had some good stuff before it went out. Derek Synclare (I can't remember how to spell her last name, feel so bad) is also a great model if you can find any of her stuff.
Also, Ogre Productions has two of my all time favorite clips (Amber's feet and Summer being tickled by the dog are my other favorites). The Samantha punishment is great.
-Etc.