I like brewing beers that use flaked corn and flaked wheat but its expenisive at my LHBS. Everything else is cheaper after shipping at my LHBS so I would like to continue buying from them for most of my stuff. I would like to purchase a bunch of flaked corn and wheat to last me a year to save on shipping but does this stuff go bad if it sits for a year or can i buy a much and keep it in a cool dark place?