Skate shops. Skateboard companies make a lot of cool stickers.

Im partial to Etsy. This is a goto for any new laptop I get.

https://www.etsy.com/listing/4350620903/remember-computer-off-y2k-2in-or-3in

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Curious no one mentioned https://www.stickermule.com/unixstickers which is where I got the stickers for my current laptop.

qwertee.com has great t-sirt designs, but many can also be bought as stickers!

If you’re a drinker, usually breweries and meaderies have good ones. Also, outdoor brands, like ski and surf companies. In a pinch, your nearest hipster bait shop probably has some way over-priced ones.

Hey guys anyone know where I can buy some cool stuff? Nah I’m not interested in defining the word cool and what it means to me, you figure it out

If you want to make them yourself you could get etticett sticker paper, drint or draw on it, laminate it and cut it out.

Else you could try to find stickers online. Either a service that makes them for you or premade ones, preferrable from artists or “communities”.

As an example a german (has some english, nonlingual stuff) *tech community shop" site where the people running it try to influence politics in a way i like (against mass survailance,…) https://shop.digitalcourage.de/digitalcourage-und-ccc-aufkleber/

Tattoo artists loooove making stickers

Stickers are a form of virtue signaling. Invest in that place/ event/ product and enjoy your free sticker/ self advertising. If you want something personal, invest in an old cricket cutter and create your own design. You can also talk to people who have crickets and ask them/ rent them. “Cool” is defined by you. Put whatever you want on your water bottle.

Edit: Also, I have a cricket. Up to you if you want free stickers. I’m limited. Up to you.