Amazon $5 off $20 Book Purchase 11/23/2017 By Charlene 2 Comments This post may contain affiliate links, please see my disclosure policy. Amazon is offering $5 off a $20 book purchase again. I love these promotions. This is a great time to grab something for yourself or a gift for a loved one. Head over to Amazon by clicking here and pretty much any book sold directly by Amazon and not a 3rd party seller will work. The offer is valid until 11/26/17. Use coupon code GIFTBOOK17 at checkout.