Vihtavouri 10B101. Loads to Herco specs. $25/6 lb. jug. $20 HAZMAT fee on up to 6 jugs. After cost and HAZMAT, works out to $5/ lb.!
I apologize, I haven't learned this forum's system to highlight for link.
Copy & paste and go to third listing down.
http://www.gibrass.com/gunpowder.html
Get 'em while they're hot, fellas!