Is that not very dead? I remember trying to order some gifpop stuff back in 2021/22 and they were gone by then. I see the "make your own" page on the site is broken, the blog entries are from 2017 (hover over the bottom of each one). The copyright's updated but I think that's automatic.

I only wanted a couple of images. From what I remember of gifpop, they originally did this using a machine that was intended as a wedding entertainment, guests take a moving selfie and it's printed for you, they repurposed it for selling art gifs - seemed like a great idea.

The fallback - IIRC you could buy preglued lenticular sheets in packs of 50 off amazon, and there was a site explaining how to preprocess your images (but it's not hard)...but it was going to take a bit of effort, I don't even own a printer - so I lost interest.