その本、メルカリで! is a Chrome add-on developed by blue9 that provides a convenient way for book shoppers to compare prices on Amazon and Mercari. This free tool allows users to easily find out the price of a book they are viewing on Amazon and see if it is listed for sale on Mercari.

With その本、メルカリで!, users can instantly see the price of the book on Mercari if it is available for sale. This can be extremely useful for those looking to save money on their book purchases, as they may find the same book listed for a lower price on Mercari. The add-on seamlessly integrates into the Amazon website, making it effortless to use.

By using その本、メルカリで!, book shoppers can quickly and easily compare prices between Amazon and Mercari, potentially saving money on their purchases. This add-on is a valuable tool for anyone who enjoys shopping for books online.