We stock up on the sales. Save our coupons, and get some coupons from others who are not using them. Typically you have to buy two packages, & wipes, and the stores will give you $5-$10 off your next purchase, coupled with coupons for everything.
The problem then is keeping just enough so that the baby does not grow out of them before you run out, and not having too large of a stock pile that you are left with a lot of packages.