There are a lot of online marketers of black powder supplies. do a google search for several that have the best prices. Just remember that there is a hefty haz-mat fee for powder and primers added to the cost before shipping. It's the same fee for 1# or 20# of powder, so order as much as you can store safely, along with a good supply of caps. I would look around locally first, if you have a cabela's close. Or call some gun shops. Many don't stock black powder anymore becuz of the restrictions, but do stock BP substitutes. Triple777 is pretty good. cleans up with water, too. Not as corrosive as BP, but still needs to be cleaned up after shooting. A lot of good guns have been ruined by guys that neglected their guns after shooting. BP residue can rust a gun in a day or two. It is hydrophilic, meaning it pulls moisture out of the air. But you probably already knew that. If you only want black powder, you'll probably have to suck up the haz-mat fee and order it. Some clubs store their black powder in magazines at their ranges, but you will never get them to sell it to a non-member. Joining may be a fun option. Good luck.