jobber
n.—Gloss: A wholesaler. «Within the next few years, the trio hopes to sign up 90 oil distributors (also known as jobbers) to form a group of as many as 2,000 C-stores east of the Mississippi selling private-branded Liberty gasoline.» —“Liberty Gasoline Is Good News” by Gabriel Thy The Two-Fisted Quorum Jan. 21, 2009. (source: Double-Tongued Dictionary)
Further reading
What exactly is a planet? Controversy over this question led to Pluto’s redefinition, along with a brand-new English word. And: Some people now use the phrase all the things! to mean and whatnot or you know what I mean. This new sense of all...
She sells seashells by the seashore. Who is the she in this tongue twister? Some claim it’s the young Mary Anning, who went on to become a famous 19th-century British paleontologist. Dubious perhaps, but the story of her rise from seaside...
I don’t have a quote, but in the late 70s, a friend wanted to open an auto parts/supply store. As he contacted wholesalers, they referred to him as the “jobber.”
However at about the same time in the early 70s in pharmacy field we had a slightly different usage. We referred to the wholesaler, who sold medications, devices etc. from many different manufacturers, as a “jobber.”