[newaccount74]

It sounds like that should be allowed. But I think that fulfilling button, stickers and t-shirts orders is pretty expensive, and only makes sense if people give big tips (eg. if someone tips 5€, there's not going to be much left after you pay someone to mail them a sticker).

[sigmar]

"thank you for your button order. We expect to ship this order about 1 week after the heat death of the universe."

[chongli]

Or perhaps more realistically, tell them they can pick up their button when they come to meet you at the next DevCon.