Local places to buy Powder and Primers in California
Buying powder and primers online tends to incur hazardous material handling fees. Because of this, it is frequently cheaper to buy locally and transport the powder yourself, even if the price is $10 or more over the online price. This site is only for reference to local, walk-in stores.
Gun shows provide another source of walk-in powder and primer acquisition, but they aren't available all the time.