Organic produce seems the best way to go. But has the word "organic" been overused by industry to get you to buy those more expensive foods? Are those organic eggs really all that organic or free-range?
Look around. Ask around. Find someone that's raising chickens and selling eggs. Maybe go to that place and watch those chickens forage (I had a friend tell me that watching chickens forage was like watching fish swim around a fish tank. It's so restful). Know from where your eggs come. It's more work - but the payoff is really, really worth it!