So this is a promotional post, but I do really think it's an awesome deal. Amazon.com does what's called "Amazon Mom" club. Basically, you get Amazon prime, (so free 2 day shipping, streaming movies and TV) plus cheap diapers and wipes, as well as other baby items. Another fun feature is their subscribe and save option, in which you can subscribe to different items (sign up so they come monthly, every two months etc.) and you can get 20 % off of those. I have loved this for diapers, wipes, toilet paper, paper towels, christmas presents etc. Everything comes in big bulk, so I have them come about every two months.
Anyway... I have a link here you can follow :)