It's complicated to make cost comparisons - do you compare own brands or known brands, etc. But in the UK shoppers report Aldi and Lidl as being better value
Aldi in the us has a cheap weekly meat special on par with Costco. Fruits and veg is also cheap, and then all of the brand name knockoffs. You can find meat a bit cheaper if u shop around. I think hyvee is basically the best of all options.