>> All I am looking for is corn in sacks available in the cracked "grind" for lautering purposes.
Unfortunately, that's never going to be possible. Once corn is gelled to make starch accessible, it's a pudding-like mess. Traditional / beer lautering methods simply won't work. As for corn, you need to know Indiana produces something like a billion bushels (seriously) of corn annually. Is it intended for animal feed? Well, yes, as is all corn that used in distilling. It's most likely #2 yellow dent corn some of which goes to the cows, some of which goes to making ethanol.