Kinda my thoughts right there.
I do wonder a couple things, though. Why were they trying to sell this snake? I'm sorry, but I have to wonder about a place that would try to sell an animal like this. Also, did they get this poor guy in on a shipment from a breeder or did they breed it themselves? If it was from a breeder I would certainly like to know who that breeder is so I can avoid them if they are shipping animals like this. If it is an injury from in the store, what vet said this little guy was good to go? I could go on here.
At least they are offering it up for free to someone who cares, but sight unseen (besides the pics), I can't imagine him having a good quality of life and probably needs put down.
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No, no, no, no!!! Freezing is NOT an acceptable method for euthanization. That is cruelty, plain and simple. If you're going to put it down, either pony up the cash for a vet to do or man up and do it humanely. End of story. These are all part of being a responsible owner.