If I supply the sticker separate will Amazon put one with each item sold?
If you put one inside the package, then it will go with the item (ie, put stick and item in a polybag, seal, put Item Bar Code Label on the outside.
If you send in a pack of items, and a pack of stickers, and expect amazon to pair them up for you? No, never gonna happen.
+Exactly+ what kind of sticker are you trying to include?