Great advice! We have saved tons of money (and calories) by cutting back on our meats and dairy and instead use a lot of dried beans, lentils and nutritious grains like quinoa that we buy in bulk. We also use a lot of boullion for added flavor, but you have to watch the sodium with that.
CSAs are also awesome. I question whether we have saved money using ours, but we are definitely going to do it again next year just because it has forced us to try so many new veggies and we eat so much healthier. Actually, right now I'm eating tortellini with my CSA kale and basil and I've just discovered that I love kale, who would have thought? The amount of kale that I used also has something like 700% of my daily vitamin A requirements too. pretty amazing.
I've also gotten some good buys at the farmer's market including bargains on some unusual stuff. Last week I got a bunch of amaranth leaves that I put in a stirfry (also very nutritionally dense) and a whole load of japanese mustard greens to add to my salads for super cheap