Amazon has officially launched the bundling program it announced in September, Kindle MatchBook. The program, which allows customers to buy e-book editions of print titles (already purchased, or about to be purchased) in a price range topping out at $2.99, is, Amazon said in an announcement today, now available for 70,000 titles. MatchBook, which is available for titles published as far back as 1995, was announced with only 10,000 titles enrolled.

In addition to titles from Amazon Publishing and thousands by KDP authors, Amazon said a number of major publishers have titles enrolled in MatchBook, including: HarperCollins, Macmillan, Houghton Mifflin Harcourt, Wiley, Chronicle Books, and Marvel. Speaking about MatchBook, v-p of Kindle content Russ Grandinetti said: "MatchBook enrollment has grown from 10,000 to 70,000 titles in just a few weeks and we expect it will keep expanding rapidly in the months ahead."