Where do you go? Do you get everything in one store?
Being overseas for 8 years, we relied on the commissary for the majority of our food shopping. Although we [haha - me] did go off base for some things. Now that we're back in the States I shop at the commissary and Kroger (the only other grocery store other than Walmart here). I find that with the Kroger card and specials they run, I can get things cheaper than the commissary.
However, shopping at two stores is exhausting.