I have a few tips fi have learned from my 24/7 lifestyle that I lead. First, I never go to a store for my diapers. The quantities available in the stores are too small and too unpredictable. What I use is a website: www.hdis.com. They have a wide variety of brands and sizes and they can ship automatically monthly. It's very convenient. If you are on Medicaid and get a doctor script like I do, then 250 diapers a month are free. By using Hdis, I chose the brand that works well for me.
The other site I would use is amazon.com. Thier baby care site can ship wipes to you in increments of 500 (500, 1000) for less then you buy in the stores