Good Morning John, 

Thank you for contacting the U of M Extension Service. 

Please click on the following link from the U of M Extension Yard and Garden website: 

https://extension.umn.edu/trees-and-shrubs/serviceberry

This information states:

Also called juneberries or Saskatoon berries, several serviceberry species are native to Minnesota and other parts of the United States.

If you scroll down, it disusses different cultivars of serviceberry. 

Once you decide on a cultivar, you could contact a reputable local nursery to ask if they have plants available, or if they could be ordered. Many nurseries have their perennials on sale this time of year. If they do not have them, you could ask for recommendations of where to find them. 

We do not endorse or recommend any particular nursery or business. 

Good Luck!