Update: This offer has ended.

Another Prime Day deal from Amazon will take $5 off any physical book worth more than $15. This deal doesn't work with third-party sellers, even when fulfilled by Amazon, so make sure it says the book is shipped and sold by Amazon. Use code PRIMEBOOKS17 during checkout to get the discount.

Here's a couple books that fit the bill:

Also, if you're more into Kindle ebooks and not physical books, there's a deal on Kindle books as well. Buy any Kindle book and get 40% off your next book purchase.

See at Amazon