If you are lucky enough to have a store called Trader Joe's you can get organic at a lower price than some larger chains. I buy my peppers, potatoes, cucumbers, and some meats at Whole Foods because the chain I go to doesn't have these in small quanities. I can buy my fruit, most of the time, at the chain I go to. Also frozen organic is good. I add them to muffins or cereal.
Living in a TinCan you are limited. I don't buy processed foods so both my small frigs are full of fruits, vegetables, dairy, and things I make for lunches.(tuna salad, three bean salad, chicken pasta, and other things). I try to make these on the weekend so all I have to do is just put them in seperate containers for our lunches.
I do cheat sometimes and buy meat/dairy on sale at my chain. Yea, the cattle probably lived and were fed in a feed lot. I buy my tuna in bulk from Costco. If you want some processed stuff you can get it in great quanities at Costco. They have quite a selection of organic. I just dont have the room.
Of course, the ultimate would be having your own cattle or barter for a neighbors grass raised cattle. Also your own chickens and other critters along with a full garden and green house. That is on the back burner for us now. I buy my food weekly with a strict budget and pre planned menu. This menu includes treats, breakfast meals, and lunch meals. We probably spend $100-$120 a week for two.
Check out my post about how to pre-plan your week the weekend before. If I had a freezer I could make large amounts of ....say...skettie and freeze a few batches.