With $50 extra, I would pay the shipping to rescue another giant snake. I have a few afrocks from members of this site, plus a couple of burms from other places. I don't pay money for rescues, but I will often pay the shipping to get the poor animals to my house.
By the way, both of the afrocks I got from members here were healthy, just too much of a handful for the current owners. (as afrocks often are!!)
"To truly rescue an animal one has to provide long-term care that guarantees the animal's security for its natural life, because rescuing is more than removing an animal from a bad situation. Rescue involves restoring and preserving the animal's dignity for its natural life without stress, and this includes conserving the species as a whole for generations to come." (Brian Werner, founder TMLF / TCWR)