I don't know that they have the record but their not far from it at $30. I paid around $30 for a pound of Black Mag 3 a couple of years ago at Cabellas. Then again that was a pound of powder not just 10 oz. At less than 70 grains by weight for 100 grains by volume it works out to close to the same amount of shots as a pound of real black powder. Maybe your right on that most expensive thing.
I will try some for sure but it needs to be more competitively priced if they want me to continue buying it. That is unless it beats the crap out of all the other powders I've tried which I doubt it will. If $30 is the retail price it should be available for more like $23 to $25 at places like Sportsmans Warehouse and the like. The article quotes $24 for 777 and I get it for under $20 most of the time, I haven't checked the prices in the last month or so so they may have gone up.