I'd stick to normals for a lower price.
Jason Nelson has some normal great basins and sonorans for sale on kingsnake for a decent price. Link below.
http://market.kingsnake.com/index.php?cat=98
John Cherry was another breeder I was aware of that has breed bulls in the past. You would have to email him to find out if he has any available. Link below.
http://www.cherryvillereptiles.com/bull.html