In doing a little research, popcorn folks are already selling different kinds of corn kernals for different popcorn. I have never bought from http://www.amishmart.com/popcorn-colored-popcorn.html but they have a nice website that I found via Google.

Most of us think of yellow corn meal and white corn meal, but that is simplistic as red wine and white wine. Some chiefs know that to have a product cook up just right, they have to use the same corn meal that was used by the original cook.

True Rhode Island Jonny Cakes (if I spelled it right), for example are made from single pass, stone ground, 8 row, Rhode Island Flint corn. Two mills that I know of still provide the product, Gray’s and Kenyon’s. They ship around the world. Flint corn is hard and shines, and RI flint is harder than most flints. Popcorn is made from flint corn. Dent corn has a soft starch, and makes a very different product. Dent is by far the most widly grown, and is the product used to make cattle feed and ethanol.

In the past, for my own use, I have grown Mandan Bride, said to have come from the Mandan tribe of the Dakotas, and a blue flint originally from Mexico. This summer I plan to grow an heirloom yellow dent from Michigan,called Nothsine Dent that is said to produce a very soft,sweet flour. Seed for heirloom corn can be bought from http://www.johnnyseeds.com They don’t sell Rhode Island Flint, though. If you need it, I suppose that one of the listed mills could put you in touch with a farmer who still grows it.

Somebody could put "varital" corn meal in little bags, and sell it. I wonder if people would notice?
http://www.kenyonsgristmill.com
http://www.graysgristmill.com