You can't justify a $350 vet bill for a $35 snake, let's hope you could justify spending more than $35 for husbandry supplies.
If you can't afford to take proper care of the animal, you shouldn't have it. Of course the snake would most likely die if it was in the wild... but it isn't in the wild. It is YOUR pet and it is YOUR responsibility to make sure it has the best care possible. You should've thought about that before purchasing this animal.
If you say the cost of responsibility cannot outweigh the benefit of having a snake, what exactly is the benefit of having an unhealthy snake? If you will do everything you can to make sure the remainder of the snake's life is humane, then you will find a way to get it to the vet... deal or no deal, discount or no discount.