Thyme, these are available in many seed catalogues, esp the kidney beans. I believe there are several cultivars. They are ususally bush beans and will require the same growing conditions as green snap beans. Some may need too long a season for the far north but most of us can raise them.
If you don't find them elsewhere you might check with Vermont Bean. They carry a wide selection of beans. In most catalogues they will be in the section for dry beans.
Good luck.
LC
ETA: And yes, you can plant from the sack from the grocery store. While it is possible that they are hybrids it is unlikely. There is, of course, no way of knowing how that particular cultivar will do in your growing conditions. That would likely be the case even if you bought seed.