The best bet for finding low sodium foods is to make your own from the most basic ingredients you can find. For example, make spaghetti sauce from tomato puree and spices instead iof buying the jar. The same goes for reducing fat, trans-fat and sugar. You'll have a hard time finding packaged foods without it.
By the way, keep an eye out for the MSG as well as salt--it's a major source of sodium in packaged food.
GLT