Check your local indie and alternative coffeeshops, bookstores, and record shops. Find the weirdest highschooler you know and ask them, for good measure.
I’m a big fan of local zines from my area, so I would look around your arts/music societies to see what’s up.
https://microcosmpublishing.com/
I like this site and have used them a couple of times. Shipping sucks but they are pretty transparent about it. The owner apparently had some internet drama but I’d say they got a great selection of cool stuff
Good luck on finding your zine! It’s a cool ass subculture