Sour Patch Kids Berries is one of the many flavors of Sour Patch Kids released. This Flavor includes 3 exclusive flavors, that can't be found in the Orignal Flavor, and one other flavor (Blue), which can be found in the Orignal Flavor (Before Late-2013, it was exclusive.)
These are a bit common. They aren't as common as the Orignal Flavor, and Watermelon, but you can still find them at CVS Pharmacy, Tom Thumb, and Five Below.