MDC will have native pecan seedlings... but from personal experience, you'll be looking at close to 20 years for a seedling pecan to come into bearing, and nut quality will be a crapshoot. The kids and I planted about 500 2-yr old seedlings of Major & Posey in a CRP riparian bufferstrip here on the farm, back in 2000 - biggest survivors are just now coming into bearing. Grafted trees will begin bearing in half the time, or less.
By all means, plant grafted specimens of
scab-resistant Northern/Midwestern-adapted varieties, like Kanza, Hark, Major, Posey, Greenriver, Oswego, Shepherd, Warren 346. Unless you have an air-blast sprayer and are prepared to spray for pecan scab, many of the commercial-type pecans, like Desirable, etc., are gonna be heartbreakers...you may never get an edible nut.
Let me put in a personal plug for 'Major'... KY-origin nut, used extensively by USDA in their breeding program for the northern/midwestern pecan belt as source of genetic scab-resistance, as well as precocity, heavy annual bearing and excellent kernel quality... and, in drought years, it just makes smaller, well-filled nuts, instead of full-size nuts with shriveled, unfilled kernels. Genetic evaluation has shown that it is actually a complex hican, with gene markers common to shagbark and bitternut hickories... 100 years after it was selected out of the Green River delta native pecan forest, it's still a very good pecan.
Bill Reid's list of cultivars linked below is a good guide for specs on appropriate Northern/Midwestern varieties:
http://northernpecans.blogspot.com/p/blog-page.html
Haven't looked at Stark's offerings recently, but they're pretty limited, and some will not be suitable for your site, or home/low-input plantings.
Forrest Keeling nursery, over at Elsberry MO offers RPM-grown grafted specimens that should work for you.
My friends at Nolin River Nut Tree Nursery (
www.nolinnursery.com ) offer a wide selection of grafted pecans, hickories, persimmons, pawpaws, walnuts, etc. They're a small, family operation, and are typically sold out a year or more in advance.
Rock Bridge Trees is also a potential source for grafted selections that would be appropriate.
Unless a Southern pecan nursery is using a Northern-adapted seedling rootstock like Major or Giles seedlings, the possibility that your grafted trees could be taken out by a 'test' winter is pretty substantial. Fellow down here in KY planted 1000 grafted pecans out of a TX nursery back in the 70s... while the grafted Northern varieties were plenty hardy, the southern (Elliott seedlings?) rootstocks were not, and the winter of 1978 took 'em out... killed the rootstocks stone-cold dead.
TyTy?...AACK! Probably THE VERY WORST NURSERY EVER!!! STAY AWAY FROM THEM!!!
Bass Pecan is great... may have appropriate varieties AND appropriate rootstocks... but ask before you order.