Whitney crabapple is offered bare root by a  number of online sources so although it is currently out of stock at many of these, the shortage is probably seasonal.

Although we do not recommend or vouch for the reliability of any vendor, at the moment Whitney crabapple appears to be available here:
https://theappletreeguy.com/product/whitney-crab-apple-trees/

Chestnut crabapple has some of Whitney's characteristics and is a popular alternative developed by the University of Minnesota. It's described here:

https://www.startribune.com/chestnut-crabapples-make-a-sweet-or-savory-treat/396819521/

The University of Minnesota is using Honeycrisp in its breeding program.  The most recent cultivars are listed here, some of which are Honeycrisp descendants.

https://mnhardy.umn.edu/varieties/fruit/apples

Triumph is an even more recent example of these.  Go here to learn about it:

https://www.kare11.com/article/news/local/u-of-ms-next-apple-has-been-named-introducing-triumph/89-cbcb4b59-8d7d-4b12-9213-fe0091bca9fb

We don't know of a sweet cherry variety that's reliably hardy in Minnesota. Some claim Evans Bali cherry, a sour variety, is sweeter than most.  Go here to learn about it:

https://trees.umn.edu/evans-bali-cherry-prunus-cerasus-evans-bali