A friend of mine has a breeding pair of Yellow Rat Snakes up for sale. They produced eggs last season but they didn't hatch (don't know if they were incubated correctly or not.) I will get pics in the next few days. Their temperaments I am now sure of; they feed ravenously on smaller rats. I have seen these two eat and she uses them as a "garbage disposal" for her other snakes' prey items if they refuse a meal
Please PM me with an offer if you're interested.