Have you checked out the Gluten Free Club?
TasteGuru Gluten Free Club Taste Guru delivers only the best-tasting gluten-free food on the market. Sign-up and get ready for new taste sensations every month. It's delivered right to your door--always with free shipping.
I don't know how the prices compare but it's worth checking out and the free delivery convenience might make it worth your while if you usually have to run all over to different stores to find products.