Where Would I Get Calcium Ammonium Nitrate From.?

There is a method of making 68% nitric acid very easily, but it requires sulfuric acid and calcium ammonium nitrate. I already have the sulfuric acid, but I can't find out where to buy the calcium ammonium nitrate from. I know it is used in a lot of fertilizers, but I can't find any. Does anyone know where to get it, or what brand of fertilizer contains it? I would prefer it if I could get it at a hardware or gardening store, rather than online. For anyone that is interested, the video is at

Watch movies online