Looking online may be a good start if you don't have any local grocers that carry almond flour or coconut flour. If you happen to have a Whole Foods or Natural Grocers in your area, they will have a good selection. I am not sure about different brands, but I have bought my coconut flour from Tropical Traditions online. A good resource if you want to start cooking with almond/coconut flour is http://www.elanaspantry.com. There are many recipes and tips for using both types of flour as those are the main flours she uses.
I hope this helps! Happy baking!!!