Is there a good way to buy only products that avoid use of these chemicals?
I live in central Illinois, so it's fairly easy to find local (within 30 miles) producers of most raw foods (meat/veggies/eggs), with the exception of milk. While this may be difficult in some parts of the country, I find getting to know local farmers and buying directly from the ones that do not use these practices (farmer's markets are great for making those connections) is the easiest.
Though, as I said, I live in a farm rich region, so it may be much easier for me than others.