Unfortunately, many people live in areas where there aren't co-ops, farmers markets or even organic fruits/veggies sold at the supermarket. I live in one of the most obese cities in the US and there is a reason for it.
We have one major grocery store chain even though they have gotten better at carrying a little more organic. There is a small health food store, but usually their organic produce is almost rotten. The farmer's market will sell organic fruits, but veggies are rare. Like others, I have to pay alot for organic. It just makes me more careful about my food. I plan very carefully and don't buy too much at once. There are times I had to buy non-organic veggies, but I try to stick with the ones that are least polluted. I have asked the produce guys to try and get certain veggies that I like. They have tried to work with me because they know I'll buy it.
It upsets me that people will pay so much money on their cars, the clothes they wear, the toys/books/etc., but they won't sacrifice for their one God-given body.