I shop at Walmart not so much for the monetary savings, but for the time/trip savings. It's a super center, so I can get oil for the trunk and ice-cream for the kids. Otherwise, I'd have to go to O'Reilly's then go 5 ~ 10 miles to get ice-cream, oops forgot to get eggs, think I'll get that lawn chair too etc. It's an offline Amazon.

My family actually drives past regular stores because of the selection at a super center.