Vinyl Stickers
The cheapest way to carry the message, and arguably the most effective — a sticker ends up somewhere you look twenty times a day.
These are kiss-cut on durable adhesive vinyl with a high-opacity film, which is the detail that separates a good sticker from a bad one. High opacity means you can apply it straight over an existing sticker or a scuffed patch of paint and nothing bleeds through. At 95µ density the vinyl is thick enough to survive a laptop lid, a water bottle in a dishwasher-adjacent life, a helmet, a toolbox or a notebook cover without lifting at the corners.
Available in 3″×3″ and 4″×4″. Application is genuinely bubble-free provided you clean the surface first — that's the whole technique.