Two sales announcements in one morning! Bob's Red Mill is having a sale on holiday baking essentials, including gluten-free flours, baking soda, baking powder, brown sugar, xanthan gum, and gluten-free oats. There's no promotion code, just visit the Monthly Specials page to see the discounted prices. Note that not every product on the specials page is gluten-free, so read product information carefully before ordering. Most products can be ordered in bulk.
Disclaimer: I'm just a fan so spreading the word to others. As of yet, I'm not accepting free samples from Bob, but Bob, if you're reading, I wouldn't say "No."