Create a package page where you can choose quantity of x, in size y and quantity of a, in size b. (To sell magnets, stickers, or buttons, etc.) This way I can order 100 magnets, 100 buttons 2" and 100 buttons 1", and 50 stickers. And have our previous proof(s) available under our own personal store.
I would love to be able to order a design in a sample pack that had a wide range of your products in my design so I could decide what I wanted to order the design in after seeing them in person - different types of stickers, tape, magnets, cards etc