Walmart is disgusting but it' not the only one. I try as hard as I can to buy stuff made in the US. Vote with your dollar!!! It's the only vote that's really counted. As much as it kills me sometimes, I avoid all produce from Chile or any other place that's out of the way too.
http://www.organicconsumers.org/btc/WhyNotWalMart.pdf
http://www.organicconsumers.org/btc/WhyNotWalMart.pdf