We recently discovered our local grocery co-op, and I think it's an amazing way to save money on food. In case you don't know what that is, it's a group of people who pool their money together to buy something straight from a wholesaler in order to save money.
Once a month, the co-op puts together a basket of various groceries and you call in and tell them how many baskets you want (a basket usually includes three kinds of meat, four kinds of fruit, five veggies, and some other stuff). Near the end of the month the co-op places the order directly from wholesalers and distributes it to various drop-off locations. Then you just show up at your local drop-off location and pick up your food.
We have been participating in our local food co-op for three months now, and we just love it. The food is very high quality and we end up paying about half what we normally would at the grocery store. There's a variety of different items and it changes every month, so it's kind of an exciting surprise to see what you will get.
I would highly recommend joining a food co-op. Here's an online directory if your interested: http://www.coopdirectory.org/