... they had someone price-shop at all of the major grocers en-route or near to WDW.
Wal-Mart is certainly cheaper, and Publix is probably second-best, but I find that both of them are somewhat time-consuming options. I'd rather spend an extra $10-15 and not have to waste an extra 40 minutes or more getting to Publix, or in the case of WallyWorld, more time waiting in long lines. I don't want to spend any more of my precious vacation time than I absolutely have to on the chore of grocery shopping.
My choice? I go with the SuperTarget on Orange Blossom Trail on the way in from the airport. One-stop shopping right en route, and they never seem to have long lines. I also bring coupons from my bin at home, if I'm buying name-brand convenience foods, (which is most of what I buy in Orlando, except for milk, soft drinks and fresh fruit.)