I am not an expert on apples by any means, and my experience with them are very limited. But, I have tried quite a few of UMinn varieties over the last couple months: Honeycrisp, Zestar, Sweet Sixteen, and today, a SweeTango. I've really liked what I've tried so far, and I wonder if their other offerings, like this Frostbite, plus State Fair, Prairie Spy, Keepsake, Haralson, etc are similar in quality. I know a lot of these apples are related to each other, but they do seem to be consistently good fruit.
As @Matt_in_Maryland, mentioned, Cummins does sell Frostbite, along with other UMinn varieties. They have FB on B118, and G935 rootstocks.