I go to albertsons, food world, or winn dixie once a week to take advantage of great sale prices combined with coupons and good meat specials (sorry, I won't buy non-frozen meat from wal-mart) and then whatever I need that wasn't offered on sale somewhere else I get in generic format at
Walmart. I pick the store with the best deals and make one stop, coupons in hand, on the way home from work. Some weeks I just skip this all together and go straight to walmart. I also know that you can price challenge at walmart but I think its just easier to go directly to the store offering the best deals.