I've been using aluminum oxide powder on my strope and think that it does a good job. However, I may be like the pig in a pen, not knowing what it's like to live in a palace. Therefore, I want to get out of my pen and try some of that yellowstone stuff everyone is extolling.

is where is a good place to get it and can it be obtained in powder form as well as stick form?
Thanks in advance to everyone who responds.