This seems to be a big misconception largely based on where you shop. My diet is primarily fresh, organic produce and we shop about once a week. Where I shop, I basically fill a cart with produce and our bill is never more than $40, unless we buy cheese or honey or something. In fact, our bill is rarely over $35.

Well, that $40 is mostly just produce. We honestly don't eat a lot of processed foods, but anything else can get more expensive. We spend the most money on honey and oils (olive, avocado, peanut, sesame), and so those things didn't go into my estimate. And to be honest with you, "organic" doesn't mean "better" in all circumstances, so just choose food wisely. When a food is labeled organic, pesticides are still used... they are simply organic pesticides that have different (although not usually better) effects in the environment. "Organic" foods are also more likely to harbor bacteria and intestinal parasites. Let me know if you need more information about that (I'm an ecologist and it's my job to know this stuff).

My best advice if you want to spend less on produce is find cultural markets. These stores often have a really interesting mix of vegetables at fairly cheap (often bulk) prices.