No too bad, but when you can make 10 lbs of your own for about $5 its even better...
https://www.dhs.gov/ammonium-nitrate-security-program
It's the new world we live In kids
Sure... But how would you do that? Cheapest AN I found was from China and it's around $500/Ton FOB China. Then you need Aluminum, about $8/lb if you buy a decent quantity. I called plenty of places trying to source domestic AN and it's difficult as can be. Mining companies make it, but generally won't sell to you. I had even planned on getting ATF explosives manufacturing license and couldn't get people to return calls. If you can find 34-0-0 that is often coated to make it slow release. The prilled AN is supposedly perforated which improves surface area available for the reaction to occur. I've read stories of people putting 34-0-0 into a blender to make the AN more readily available for the reaction.
I see reactive targets eventually going away due to insane regulations. At least the AN-based ones.