They sold me 50 lbs: King Arthur Sir Lancelot Hi-Gluten Flour
I couldn't see myself paying a small fortune for shipping high-gluten flour to my home, so I went hunting for a better deal.
I went to the King Arthur web site, found their commerical distributor for Denver, Colorado (Dawn Foods), called them up, asked if I could buy a bag, they said yes, I went, I HAVE: 50 lbs!
The biggest hurdle for me was squelching the "A commercial distributor will never sell to little ole me. I'm a nobody. They don't deal in 50 lbs., they deal in 5000 lbs. They won't sell to me."
How much did I pay? $26.70
Yup, about 77% OFF the retail price on their website (and that doesn't include shipping), so probably 95% OFF.
I bet you can do the same thing in your area, especially if you have one of King Arthur's distributors nearby.
Hope this helps you find some for cheap, but I certainly won't be able to help you use 50 lbs.
That said, anyone in Denver need some?