1. According to the Daily Mail, the price of food and drink products increased by an average of 5.9 per cent last year - considerably above the official rate of inflation. The supermarkets are definitely squeezing every last penny out of us. So I've downgraded from the luxury grocery brands to standard or budget brands*. There are certain things you might not want to risk (like meat?) but for canned vegetables the difference between own-brand canned tomatoes and fancy-pants cans is negligible. As for health benefits, there are some unexpected positives! I found that own-brand "juice from concentrate" often contains nothing but concentrate and water - it's cheaper than adding the sugar and preservatives the more expensive manufacturers use in their concentrate. To compare specific stores' own brands try this link (UK) and click on the handbook to see recent comparisons.
2. Hank's lunch meats and cheese are significantly cheaper at the grocery store's Deli Counter than when pre-packaged - and can be sliced to my exact portion needs.
3. Bulk buying dry goods at Costco. Membership at Costco usually costs $50 a year in the US. I've not found a way to share membership with friends but if you have a friend who is already a member, ask them to let you buy a Costco pre-paid card from their account which you can use, not just the registered member....
4. ... But avoid buying too much food at Costco! Buying "little and often" still makes sense for perishable products. Apparently Brits throw away 3.6 million tonnes of food each year, 60 per cent of it untouched. This link offers ten good ways to use leftovers including bread, meats and veggies. Don't forget you can quickly mix almost anything into a good ole omelette.