I've just submitted design questions and ideas to a printer for the stickers.

Looking into fridge magnets too. The flat flexible kind. Shaped like a circle, and of course a design inside of it I have in mind.

If it's not too expensive it'll be a home run!

Edit: I found a local company that makes them right after I posted this. They open at 10am (it's 4 am now). The prices look low....doable.