Like anything else, it depends. Some of their packaging is smaller yet the same price as a grocery store. I only buy standardized stuff from DG or WM. Things that don’t come in various sized packages depending on store. We do get our paper products from DG. Soda and the occasional Red Baron pizza. We’ll buy one or two things, get the $5 off $25 or more coupons that are good on Sat. only and then go back Saturday. Last time I went, the total was $25.25 before coupon so it was pretty close to a 20% savings.
I shop sales. Any meat I buy is either on a good sale or manager’s special with $2-3 off the price.
If you were adding in the 628 bucks a month for a family of four in food stamps, you could shop like a potentate.