Hausbrot (locations all over the city) sells a whole range of organic, whole-grain breads, as well as facturas and treats, dry pasta, and empanadas. However, I've actually started buying my bread at Meraviglia (a vegetarian cafe located on Gorriti and Carranza), as I find it much tastier (tastes just like Eli's Health Loaf, if you're familiar with that brand in the US.) Their bread is sold fresh out of the oven, as are an assortment of whole-grain cookies, granola, and other goodies.