Originally Posted by dekul

It's cheaper to buy it on ebay, and more pure, and smaller granules (which is better for almost everything you want to use it for) I paid 35 bucks for 20 pounds. But others have pointed out, If it is illegal or otherwise hard to get where you are, you can make it yourself if you have the patience. I cant believe it would be illegal, it's used in fertilzer, and among things used in fertilzer it's not even close to the most potent... (Ammonium Nitrate + Diesel made a big boom in Oklahoma City)