In addition to being found in many plastic bottles, Bisphenol A is also found in the epoxy resin liner of most canned fruits and vegetables. The BPA from this lining has been shown to leach into the vegetables in the can. Studies have shown that amount leached is enough to cause breast cancer cells to grow and proliferate in the lab.
One company that makes BPA free canned beans is Eden Organic, showing that the technology is there to make cans for most fruits and vegetables without using BPA-contaminated products.
Another reason for buying fresh or frozen vegetables is that they tend to have few preservatives and less added sodium. And buying fresh vegetables means you can talk directly with the farmers to learn more about what pesticides and other chemicals they use (or dont use) during the growing season.