Well, I generally have a set list of websites I visit for this fetish - when I'm in the mood for a session, I'll got to the same three sites (Hypnohub, E-Hentai Galleries with the "mind control" search, and DeviantArt) ; I've also got the Hypnohub Forum, MC Forum and Hypnopics Collective that I visit every day, because threads that interest me tend to pop up regularly ; and finally, there's a few websites that aren't updated as regularly but that I visit from time to time - namely the Mental Block Wiki, a blog by a Japanese guy called "Triggerrock" that lists mind-control scenes in manga, among other things, and some Youtube channels I'm subscribed to that collect clips from the media. Oh yeah, and there's a forum named charmed.variousforum.com (originally charmed.forumotion.com) that collects scenes of "Good girls charmed by bad girls" - unfortunately, that one's pretty inactive right now.
I dunno, this might seem like an extensive list, but it covers pretty much all the bases I need for when I have the itch.