iso: flint type corn for northern wisconsin garden

I have been working on my current garden for the last three seasons. Where I started was bare turf grass on very sandy loam in northern Wisconsin. That means the seasons are short and the conditions are favorable. I have been growing for years in many different climates. With this site I have been trying to focus on a few staple crops and really trying to learn to cultivate to their yield potentials. I have been working to build soil in a ruth stout style garden bed, as I have access to square bales of straw at a decent price.

It goes without saying finding strains and genetics of varieties adapted to where I am regionally and go from there, well that isn't always as easy as it may sound. Which brings me to the plans for next season. I am going to be converting an area appox 20 x 50 for an area to grow a corn guild. That should put me in the 150-250 plant range depending on how dense I am able to plant. The next part of this journey is in the selection of corn to cultivate. I would love to tap into a flint/dent type of corn that can grow tall, and yield decent, with flavor being a factor.  

What I have been able to find online has been limited ( glass gem, painted mountain, generic label of "indian corn", jimmy red, bloody butcher, Montana morado, to name a few"  Would there be anyone willing to trade seeds for point me in a direction of modestestly priced seeds that might be outside of the few cultiivars I mentioned or perhaps another type they grow closer to the 46th parallel?

Thank you for reading my post, and I look forward to any thoughts of tid-bits added...happy gardening

How many days is your frost free growing season?

Joe, I grow at 46.66 north, 15 miles from Wisconsin, in the orbit of Duluth, also on pretty sandy loam. I'm very much not an expert gardener (I think my corn experiments will be a complete bust this year, with not a single cob ready before frost shuts us down), but I've been growing corn on this property for four years (with usually better results). I save the best seed each year (favoring vigor, flavor, and dark colors) and make tortillas and cornbread with the rest. The list of commercially available corns that I have mixed into my starting grex follows:

Mandan Parching Lavender, Open Oak Party Mix, Japanese Black Sticky, Golden Bantam 12-row, Chapaolte, Oaxacan green, Painted Mountain Corn (alpine selection), Lofthouse Flour Corn, blue "indian corn", Japonica Striped Maize, chalqueno rojo, bolita azul, olotillo blanco, Cascade Ruby Gold, Magic Manna flour, Magic Manna flour, Cascade Ruby Gold, Painted Mountain Corn, Navajo Robins Egg flint, Great Plains Rainbow flint, Hopi Turquoise flour, Japanese Striped flint, Seneca Round Nose flour, Nothstine dent, Blue Clarage dent, Fire Pink Calico dent, Strubbes Green dent, Mandan Bride flour, Seneca Red Stalker, Stowell's Evergreen, Double Red, Johnson County White, Glass Gem popcirn, Bear Island Chippewa flour, Early Pink popcorn, Mandan Lavender Parching flour, Advent Gulch, Magic Manna  , Wapsie Valley dent, Bloody Butcher dent, Jimmie Red dent, Trucker's Favorite White dent, Hickory King yellow dent, Cocke's Prolific dent, Pencil Cobb dent, Montana Morado Maize, Re-Pioneer, Lofthouse Flour, Austin's Landrace, Eagle Meets Condor, Montana Cudu, Papa's Red, Rodrigo's Northern Wisconsin-Adapted Oaxacan White, Jimmy Red, Blue Corn Blend, Orange Corn Blend, Ohio Valley Flint, Polar Dent, Minnesota 13, Lofthouse flour, Mix grain corn , Bolita Belatove, starburst manna, seneca blue bear dance, Gigante Hominy self-feeding grex, Asheville Morado self-feeding grex, Speckled Parching self-feeding grex, Ultracross self-feeding grex, Conico, Xocoyul, Xocoyul rosado, Bolito belatove , Dzitbocol morado , Conico azul, Andrew's popcorn, Bear paw popcorn

I'd be willing to grab a handful of each of my saved years and also the commercial starting grex, mix them in a bag and mail them to you. If you want to send me seed that you've saved from anything that's growing well for you, I'll probably incorporate it into next year's garden. Drop me a PM if you're interested.

I can also send some, but worried about frost-free days, since I am in N Illinois. Mine is minimum 90 days.