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)
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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.”