Well, I have no need for 25 pounds of powder, I'm not firing off cannons.........Here in the US non-cartridge firearms aren't even considered firearms by most States, all but two I think and they can be shipped directly to your door, no going through a licensed firearms dealer. If you use real black powder it can be shipped via ground delivery but the shipping costs are as much or more than the black powder costs, it's considered "hazmat". I just ordered a one pound can that costs $20, shipping and taxes brought the cost up to $53. If I can find someone here or nearby that sells BP I'll drive an hour to pick it up, it's still cheaper. I can use a modern BP called Pyrodex but I just don't like it even though its cheaper and available even at Walmart.......
Maine Powder house . com
Free shipping on 25#, mixed brands and FF is fine.