The RC Cola Company no longer exists. It was bought out by Cadbury-Schweppes a few years ago. They had two citrus sodas at that point, Kick and Sun-Drop. They opted to discontinue Kick and distribute Sun-Drop more widely.
For what it's worth, Cadbury-Schweppes is about to sell off its American soft drink unit, and one possibility is that it will be merged with Cott Beverages. Cott still sells Kick outside of the U.S.