watch for sales on stuff your family likes to eat. Efficient and well organized storage will go a long ways to keeping your food edible. things like beans, we'll pick up 20 or more when they are on sale 10/$10. I then vacuum seal the beans and rotate the stock. Costco has big ole bags of sugar. They are put into quart jars and vacuum sealed. Helps with the freshness and keeps the critter away.
Really want to save money, and improve the quality of food for the family, learn to can food yourself. We started as a hobby, and it took on a life of it's own. Friend of ours said my wife would can rocks if she could make them edible... So, what did she do, but canned up some left over orange peels with vinegar, which apparently makes a fantastic general purpose cleaner. We picked up some boston butt on sale, put two in the smoker, didn't require any more energy for two than one. Left overs were thrown into pint jars, and pressure canned. Now we'll have boston butt as a literally free meal.