Source : Webster's Revised Unabridged Dictionary (1913)

Jobber \Job"ber\, n.
   1. One who works by the job.

   2. A dealer in the public stocks or funds; a stockjobber.
      [Eng.]

   3. One who buys goods from importers, wholesalers, or
      manufacturers, and sells to retailers.

   4. One who turns official or public business to private
      advantage; hence, one who performs low or mercenary work
      in office, politics, or intrigue.

Source : WordNet®

jobber
     n : someone who buys large quantities of goods and resells to
         merchants rather than to the ultimate customers [syn: {middleman},
          {wholesaler}]