Where can i buy black powder online?

Many major outfitters such as Graf & Sons, Cabellas, Gander Mountain, and others can assist you in purchasing black powder through their website. Most of what you find stateside is made by a company called Goex.

However I feel compelled to ponder if you know what you are asking for. Black Powder is not the same as modern gunpowder. Black Powder is classified as an explosive, and in many jurisdictions there are specific regulations as to both possession and storage.

Unless you are a muzzle-loading purist, it may be a better choice for you to look into some of the black powder alternatives that exist such as Pydrodex.