This is not medical advice. Check with your doctor if you have any questions.
Always, always, always check the packaging. Every Single Time. No Matter What. If you don’t know it’s safe, don’t eat it. Many GF products will state that they are tested to assure that they don’t have gluten. If they aren’t tested — be careful. Read the packaging.
Bobs Red Mill has a lot of good GF foods. In the Seattle area, they are carried by Whole Foods, PCC, Metropolitan Market, and others. Of particular note:
Envirokids makes a line of GF cerials and treats. (As far as I know, all of the Envirokids stuff is GF.)
Pamela’s has wonderful pre-made products and baking mixes. I especially like thier vanilla cake mix.
Gluteno is great tasting, wonderful texture. Think quality, not quantity.
Whole Foods makes wonderful GF stuff – they usually keep it in the freezer. I particularly like the chocolate cookies and the cream biscuits — warm them first! Ask if you can’t find it, as they often move thier products around.
PCC makes a bunch of “wheat free” stuff — they label it as wheat free because they make it at the same place where they also make things containing gluten, so there is a possibility of cross-contamination. Be careful — you also want to make sure that the staff didn’t do something boneheaded like put the GF stuff under gluten-containing stuff, or even in the same basket! (I’ve called them on this sort of stuff in the past, and they have gotten much better.)
Some Fred Meyers have GF sections — look in thier natural food section.
GF Oats are available — I’ve seen them at PCC. Check the package, they will clearly state that they are GF, and make sure that they are tested.
Davinci Bakery and Cafe on Greenwood @ 100th (in Seattle) is all GF and very good. http://www.yelp.com/biz/da-vinci-cafe-and-bakery-seattle
Romeo’s Pizza on Greenwood (about 15 blocks south of Davinci) is now serving GF pizzas!
Nature’s Market in Kent has a large variety of GF products. http://www.naturesmarketkent.com/
Trader Joe’s also has a great many GF products. http://traderjoes.com/
A quick list of stuff that is generally gluten free: