Walmart tends to package items cheaper if you buy the largest size. As far as a lot cheaper, not so much. I only buy can goods, dairy products, cereal, etc. I don't know that the quality is that great, just my opinion. I have found that when I shop the local grocery ads, I get much better deals at Safeway or Fry's. By shopping the ads every week, you know when a good deal is a good deal. I save so much money that way.