Amazon has coupon codes, I post them all the time, well okay it’s not Amazon that has the majority of them; sellers issue those bad boys. Not to say Amazon doesn’t have codes as well, but… I digress.
There is an entire section on Amazon devoted to coupons. Not manufacturer coupons, but coupons for products on Amazon. They range from a the average 5% or 10% off to as much as 90% off. From what I have seen the coupon availability is the same as most other deals, it is regional so you may have a coupon that someone else may not.
Here are a bunch of printable coupons. These are manufacturer coupons so they stack with store coupons. Walgreens and Target have their own store coupons so you can stack these with them and score some epic deals!