You can find it in the frozen bread section of most grocery stores (but unfortunately not WalMart). Not only is it much better for you than most breads made with processed flour, at 80 calories a slice it's less calories than most! Especially good as toast; several kinds available.
I keep mine in the freezer since it tends to mold much faster. I take out a couple of slices to thaw for breakfast the night before, or even just let the toaster do the thawing.