well see other post on this, but try your local corn farmers, just go with plans to buy at least a 100 lbs at a time or more, and most will be glad to sell you some for cash!
should be about 15-17 bucks a 100 lbs off the husk, and less if still on it!, as you just get less corn per lb that way!

also can try the Amish too, they don't use the pricier round up corn seed, thus can sell it for less due to it just costs them less to buy thy seed/grow it!