You have to buy that from a Seed corn company.. Go to a feed store .. We order from a feed mill ..Not heirloom.
I looked in all my catalogs and didn't find it, but noticed that there are a few listings in ebay. Iowa chief corn, IO chief corn seed. Good luck! Also try this: google "GroCo seeds"
Here is Penna we go to the feed store for farmers an buy it ......... Iowa certainly would have it. Let me type that in.
Is therte a Rural King near by. The ones around here have something called IO Chief. I think it's the same thing.
R.H.SHUMWAY'S 2009 HAS IOCHIEF CORN 2009 I just found the Iochief corn in Shumways , reasoable priced too. Page 20.... Maybe you can see it on line.. Good Luck