My 4 year old is allergic to wheat, peanuts, and a bunch of other things. By proxy, we are all gluten free.
He's a typical little boy, and wants a treat every now and again. I found that buying the individual ingredients to make baking mixes to be a pain. But, my local Big Lot's carries Bob's Red Mill mixes. You don't have Big Lot's in California, but they sell online, and you won't find better prices.
The cinnamon raisin bread, the white sandwich bread, the shortbread cookie mix, the pancake mix and the brownies are all very tasty and as close to the "real thing" as I've tried.
Just another option for you.