Stickers

$5 gets you into the whole Redleg universe: every Death Card role, every battery joke, every "you had to be there" reference in the catalog — sized down to fit a Yeti, a laptop, a rifle case, or a bumper.

Same accuracy standard as the shirts: right hardware, right unit references, nothing a real cannoneer would wince at. Easiest way to rep more than one battery, role, or joke without buying a whole new wardrobe.