We have previously authorized some sites to sell stickers, usually with something like “provide with a discount to Fedora contributors” in lieu of royalties.
However, we generally would expect that to be an ongoing thing, not just a random person selling stickers. Can you explain your plans in a little more detail?
We also want to make sure that the quality is high and that the Fedora brand is well-represented. (There are a lot of cheap stickers!) How are you planning to produce these?