Wandering through sphagnum bogs during the fall in Alaska you can often find bog cranberries (Vaccinium oxycoccos). Although the berries are typically not abundant, they are a tasty treat and wonderful addition to a berry mix. The berries are not commercially utilized in the US, but are a commodity in Russia.
Learn more about bog cranberries at this site from the USFS.
HortAlaska Berries 