I went into the local IGA (Independent Grocers Association) and found these in the produce section. I live in a small town in the mid-west with a population of about 3,500. This is something that I've never seen here.
If I go to a larger town to a Publix, Kroger, Whole Foods, or Fresh Thyme, I'd expect to see something similar. They cater to a larger, more diverse clientele.
These were a product of Canada, BTW.
Heirloom tomatoes tend to have thicker skins than Americans are used to. A lot of them have a higher acid concentration too.
I sliced this thing up and seeded it before I diced it to put in a salad. I'll be drying the seeds out so I can plant them in my flower bed next year.