Magnets and Stickers
Die-cut magnets for the fridge, the locker, the filing cabinet at the job you're quitting. Small, cheap and a little rude, which is the point. They make easy add-ons to a shirt order and easy gifts for the friend who already has too many tote bags.
Grab a few here or at 304 E 5th St in the East Village and 1630 E 6th St #104 in East Austin.