dharma,
If I were you, I'd look into container gardening.
We've stopped worrying about "organic" produce and started simply washing our produce thoroughly. "Organic" is a marketing term, and you can often find produce of equal quality at a farmer's market that is much cheaper and NOT "organic" because they didn't pay the money to be "certified" as such.
When you either eliminate or cut down the meat in your diet, you quickly find that, for many of us, meat is the most expensive part of our grocery bill. As we've researched it, if you eliminate the meat, even with organic produce selections, you STILL come out saving money (a good roast can sometimes set you back $20). Pinto beans, on the other hand, cost as little as 50 cents a pound...or even less...when combined with rice, or other grains, you have complete proteins.
My point is, yes, most of us WANT the luxury items, but we don't HAVE to have them to eat properly. Variety is wonderful, but is not essential to survival.
If I were to tell you how little our family spends on food each month, you wouldn't believe it. But our children are healthy and happy, and best of all, I'm not working 2-3 jobs just to keep them fed.