Amazon continually has ebooks for sale. Browse them yourself. You can even narrow them down by genre from the list in the left margin. For example: Children’s eBooks; Cookbooks, Food and Wine; Crafts, Hobbies & Home; History; Literature & Fiction; Mystery, Thriller & Suspense; Etc.
Thank you, maria.smith.79, for listing daily specials.
(And thank you, ChelseaCoupon24, for the link. Which can be arrived at independently: Amazon.com >on the left of their search bar toggle to 'kindle store' - click 'go' > sort by 'price low to high' > on the left menu - kindle ebooks > from the left menu -pick your genre)