Originally Posted by DumbledoreMD
What if the book doesn't have an ASIN?
you can use mobi2mobi, or probably Gluggy's mobi meta editor(haven't used it myself) to add its ASIN, which can be found on the book's amazon page. Or you can do a Mobi to Mobi conversion through Calibre, it'll also give you a valid ASIN. Calibre method is probably the easiest.