Simply place a note or card which would be a Monero meme inside any book for someone else to later find when opening the book.
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Getting book stores to accept xmr as payment would be better for promotion
Good idea. Better yet make it also act as bookmark so if someone buys the book they will keep it.
Keep in mind that people go to bookstores to buy/read a book about any topic and not necessarily crypto. Unwanted promotion is not always well received.
As a recommendation I will suggest to, instead of a sticker, put a Monero themed bookmark. Give them something they can use.