Our local ethanol plant recently added a price for Ddgs in bags, I don't know the size and I am not a user.  They must have some demand, or they wouldn't be offering it.

 Currently the price is $4.30 per bag, and I include a link to refer to changes, if anyone wants to make comparisons.

http://lincolnlandagrienergy.com/Grain%20Prices%20information.htm

We got a small plastic bag at their open house, and found recipes for cookies with ddgs.  They made an interesting offering to guests, explaining the contents, and tasted pretty good.  I don't believe we could use a 50# bag for that purpose very fast, though.