I'm located in Warrenville in Northern Illinois, not far from the City. Any Vinifera variety in our area would have to be grown in a greenhouse. The most recent winter we had would have killed most Vinifera varieties. I have cold hardy varieties in my vineyard, but I will be using all of them in winemaking and won't have any to spare.
Here is one resource:
https://www.illinoiswine.com/cgi-local/classified/classifieds.cgi
Several vineyards will post what they have available here, although typically they sell by the ton. There are a few places in Wisconsin and Michigan you can go as well. The majority of the grapes will be cold hardy hybrids. Here is one as an example:
https://www.mitchell-vineyard.com/
If you're in the Chicago area there are a few places that order in a truck of Vinifera grapes from other regions, and if you get your name on the list there will be some lugs for you. Chicagoland Winemakers in Elmhurst is one such place (At least when I checked 2 years ago.)