A "jobber" is kind of like an older term for "middle man." They used to be popular in some of the animal trades.
You just sound like you want a breeder. There are HUNDREDS of breeders that make a substantial portion of their income from breeding snakes - and thousands that do it more as a hobby that a true income-generating business. Check the signatures of almost everyone posting here for a link o their site.
serpenco.com, cornsnakes.net, and cornutopia.com are good ones. Don't exclude, however, those posting here and on other forums/classifieds, BHB Enterprises, etc.
Just do a google cearch on "corn snake breeders" and "cornsnake breeders." You'll find a bunch. Google "cornsnake classifieds," too. There are literally too many to list.
KJ