/cgl/ - Cosplay & EGL

I'm thinking of doing babby's first cosplay at Otakon, but need to purchase a few relevant badges to sew onto the outfit, namely two of these https://www.loopaza.com/schwarzesmarken-666-schwarzesmarken-wappen.html

But as above I've mostly found them on these weird aggregator style storefronts and don't really know what their whole deal is or if they're legit or what, anyone have experience with the above or otherwise similar, reputable sites?