Original sentence: It began as the Mt.It continues to be widely available in most US grocery stores.Shasta is a  U.Shasta is generally cheaper in price than more mainstream brands, like Coca-Cola or Pepsi.soft drink brand that reached the peak of its popularity in the 1980's
Edited sentence: Shasta began as the Mt.Shasta is a U.Shasta is perceived as being cheaper or of having less quality than more mainstream brands, like Coca-Cola or Pepsi.soft drink brand