I'm from Pennsylvania and I used to get this kale all the time at the grocery store, but I moved to the West Coast recently and can't find it anywhere! It looks exactly like this photo:
Image source: http://www.specialtyproduce.com/produce/Kale_Purple_764.php.
I've seen this referred to as purple kale, salad savoy, and flowering kale, but I don't think any of those are 100% accurate. The purple kale I've found here is tougher and more bitter, with spikier leaves and a more reddish color, and it doesn't come as a bunch like this but as individual stems. Does anyone know exactly what this variety is called?