I have reached the acceptance stage of being a pariah in the community for rejecting thinkpads, stickers on my laptop, the thigh-high socks, and tattoos.

I present as normie, but work colleagues have no idea I used to play in a hardcore thrash band and consumed large heroic doses of LSD and psilocybin throughout my 20s and 30s. Little bit of ketamine and MDMA from time to time as well.

Anyway, may you find the flair you're looking for.

I got some KDE stickers from Cafepress.

The FSFE has stickers too

https://fsfe.org/contribute/spreadtheword.en.html

Last time I donated to the FSF, they sent me an assortment of stickers. I dunno if they still do that. If not, you can also just buy stickers directly from them: https://shop.fsf.org/collection/stickers

https://www.freewear.org/

They sell stickers and many other stuff.

US https://itsfoss.com/unixstickers-revamp/

EU https://www.teepublic.com/stickers/linux

Get a Silhouette or Cricut machine and make your own. Plain sheets of sticker paper are cheap & you can make whatever size/design you want.

(May require some graphic design skills)

Not Unix, but a good project selling stickers to fund it...

https://catbox.moe/

(Not open source, but pretty neat nonetheless)

The electronic frontier foundation has some really fuckin cook sticker designs, highly recommend!

Sometimes I come across cool stuff via the #stickers, or #fedigiftshop on mastodon

I still have some (albeit shrunken) shirts from RedBubble that had some project or Linux logos/texts. Incidentally, they also sell stickers. https://www.redbubble.com/shop?query=linux&iaCode=all-stickers&ref=search_box I would definitely get stickers from a project that helps them out though if that's your thing. Otherwise, enjoy the stickers. ;)

SDF is always a good cause.

At the gettin' place.

Etsy, ebay, amazon. They should all have options of single and packs of stickers.