BookBub is an eBook promotion service, centred around a daily newsletter that lists books that are on promotion. BookBub was founded in 2012 and has its headquarters in Cambridge, Massachusett.
BookBub is a free for readers, but charges authors a premium in order to be featured. Fees vary from $70 (USD) to promote a free science book, to $2,525 promote crime fiction that costs over $2. See full list of BookBub's prices.
Daily emails are personalised to matching readers' interests, based on preferences chosen by the reader.