SWMBO is a master at value shopping. She's turned toothpaste buying into an art, where they pay her to take it out of the store. Double coupons, .50 suddenly become 1.00 off. Uses them when they have 10 for 10 with the 11th one free.
Buy rice, sugar, flour at Sam's club or Costco. Variety of ways you can store those, I've settled on canning jars with O2 absorbers.
Learn to can! Buy locally grown veggies when they are at their peak, and can them. We have enough veggies for an entire year. The real risk of only having one years worth, is what happened in MI this year, we lost our entire fruit crop. My biggest shortage is in Cherries. It was our first year doing cherries, so we were a bit limited on how many we put up. That will change next year
Find a locally raised source for beef, pork, and poultry. We cut our meat cost in half, and have a superior quality product.
When grocery shopping, only buy the stuff you need, and only buy it on sale.
Save your chicken bones, and when you have about four, put them in a pot with some water and let it simmer for 36-48 hours. Best and healthiest broth you'll ever taste.
Left over turkey, strip the meat off the bones, make a broth from the carcass, add the turkey and frozen veggies to canning jars, and pressure can. It is the best turkey soup you have ever tasted!