I used to have an online shop for buying monster stickers. I think it was causing my site to load a lot slower, and I didn’t want to put effort into maintaining it. Plus, very few people ordered monsters, and an online store isn’t the purpose of this website.
If you’d like a monster sticker, you can email me with your mailing address, and I would be happy to mail you some stickers. I get them printed to give them away, so I’m very happy to do this! But note that it might take me a bit to actually mail it.