what breads are wheat free?
For pre-made bread, try Rudi's or Udi's. (http://www.rudisbakery.com/) Kinnikinnick also has an excellent product: http://consumer.kinnikinnick.com/index.cfm/fuseaction/consumer.home.html.
If you're concerned only about wheat, not gluten, some natural food grocery stores usually carry good options with sprouted grains. You'll be looking for breads that contain such grains as kamut, quinoa, millet, rice, buckwheat, etc. Note that kamut contains gluten, but not wheat. This is a good source for comparing grains and their gluten content: http://www.csaceliacs.org/gluten_grains.php
Breads made with rice flour, corn flour, quinoa flour, millet, amaranth flour, barley flour, rye flour, oat flour are all non-wheat flours that can be used in making bread. Even buckwheat, which is really a seed of a weedlike plant related to rhubarb. Hope that helps!