I refuse to buy milk at the grocery store or Super
Walmart. Around here the convenience stores sell milk cheap to get you in the store. 1% brand name (Hood, Garelick are the big names around here) is $2.39 a gallon at the convenience store. I also buy all deli meat (boar's head) and cheese (land-o-lakes) at a local deli, the meat is almost $2 less a pound than Stop and Shop and the cheese runs $2.49 to 2.99 a pound vs $6 at the grocery store.
We do a trip to Super Walmart 1x a month and even my DH is blown away by the difference in price. Five years ago we despised Walmart, boy do things change! Just an example, Crisco Veg Oil 48 oz was on rollback to $2, I had a coupon for $1 off. My local grocery store wanted over $4.50! I also get a lot of things like crackers, snacks, cheese sticks, jello pudding snacks, cake/brownie/pancake mixes, beans to make chicken taco soup...
Someone else made a good point, buy bulk (i.e. toilet paper) but make sure it is the cheapest price per roll (or whatever unit- per oz, per diaper, etc). I will collect multiple coupons from family members ($2 off pampers underjams, $1 off Tide, $3 gillette razors) and wait until the smaller package to go on sale. Then I can use 3 or 4 coupons and the price is actually cheaper than getting a bulk size and only being able to use one coupon.
Oh, and products are still getting SMALLER! We make a homemade chicken/pesto/bacon pizza. I needed more pesto a week ago, the jar went from 10oz (5 servings) to 8.1oz (4 servings). I swear it now looks like a baby food jar! Both jars had a price tag of $1.89. I called the 1-800 number on the back of the jar to let them know what I think and they sent me coupons for some other products.