I don't have a good answer for you, BUT,,,it is a coincidence that you mention this. I got my Natchez catalog yesterday (or the day before?) and I thumbed through it today, and to my surprise, they listed prices with all there powders. I think it's been 4 years since they included powder prices in their paper flyers. Anyway, I looked for Shooters World powders, since I've been wanting to score a bottle of Buffalo Rifle as well, cuz I heard it's usually priced cheaper than it's fancy dressed popular step-sister (IMR 5744). SURPRISE ! Natchez listed Buffalo Rifle at $47 a lb. ...most of the other SW powders were $31 a lb. I guess they are taking lessens from Hodgdon.
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so anyway, I just checked the website...no Buffalo Rifle in stock.
www.natchezss.com