The overall civilian consumer cost for a bushel of barley in current U.S. dollars.
U.S. Department of Agriculture: Barley - http://www.ers.usda.gov/Data/feedgrains/StandardReports/YBtable1.htm
This database contains statistics on four feed grains (corn, grain sorghum, barley, and oats), foreign coarse grains (feed grains plus rye, millet, and mixed grains), hay, and related items.
USDA Food and Nutrition - http://www.usda.gov/wps/portal/%21ut/p/_s.7_0_A/7_0_1OB?navtype=SU&navid=FOOD_NUTRITION
The USDA has helpful tools to prevent obesity and diseases with meal planning, trans fat awareness and allergen information on food labels.