Prices Branch, MissouriPrices Branch is an unincorporated community in Montgomery County, Missouri, United States. The community is located on State Highway JJ and Price's Branch Road and is approximately east of Montgomery City.HistoryA post office called Price's Branch was established in 1855, and remained in operation until 1908. The community took its name from nearby Prices Branch creek.Notable personCharles Leiper Grigg, inventor of 7 Up, was born at Prices Branch in 1868.