I find most of the stuff on Twitter. I follow a bunch tickle related artists, creators, and JP/CN mobile games. For example those images about were from the respective game’s Twitter accounts. I also scroll through my Twitter feed multiple times a day and stuff gets recommended to me.
If I find just an image of a scene I try my best to find video of it. If I see a game event that has a chance for a tickle scene, I would watch a play through of it, the recent blue archive event for example. In the event there was no scene, just the comic that was posted.
Sometimes I search up a gacha game and the word “tickle” in different languages too. Although usually I just tend to let things come to me, and I would research them deeper. Twitter is a good place to find stuff.