Here, we had some farmers start growing local tomatoes again, with heirloom varieties, marketed as coming from a local county. Once they had a huge following, more people wanted them, more farmers wanted to grow them ... and they had to ship them, people wanted them in winter, etc, and they switched to the same perfect looking (but little taste) varieties that were already sold in stores. I'd rather do without than eat those gassed red globes.
You might want this one too: Carrots Love Tomatoes: Secrets of Companion Planting for Successful Gardening by Louise Riotte ($2.99 - also Storey)
http://www.amazon.com/dp/B004A7YINO