Check out Amazon.com. The Gluten-Free Pantry brand is excellent! I made the scones for a meeting, and everyone wanted the recipe. Unfortunately, gluten-free goods are going to cost more, because the demand is lower and the ingredients are more expensive. That being said, you can but an item by bulk much cheaper. Chebe bread is made with tapioca flour, and with a little added cheese, comes out light and fluffy and not at all grainy like most breads. Bob's Red Mill has a good cornbread mix (and so does Gluten-Free Pantry), which you may be able to find at Albertsons or some other big-chain grocery store in the flour-and-baked-goods isle. I really haven't found a store-bought bread that I like, so I have been trying out different recipes using almond, soy, and walnut flours. For fast-snacks, I can't live without LaraBars (cherry pie is great!) and Stretch Island fruit leathers. Pamela's Products make some pretty good tasting cookies, but I found its cheaper to make my own cookies from a mix.
Be careful with food that has oats. Although oats are gluten free, they are typically processed in facilities with wheat, so they may have a significant amount of gluten in them. Gluten-free oats are ridiculously expensive, but some people with gluten sensitivities do not notice any symptoms when they eat Quaker oats. It depends on how sensitive you are... I haven't tried it yet.
Below are some links to gluten-free products you can get on Amazon that I've tried and really like. You can also just do a simply "gluten free" search in amazon and get a ton of results..
http://www.amazon.com/...232389644&sr=8-2 http://www.amazon.com/...232390171&sr=8-1 (also found at Costco)
http://www.amazon.com/...232389850&sr=8-1 http://www.amazon.com/...32390043&sr=8-46
-----
Follow me on Twitter! megankillian