Ryan, when you talk to the vet this morning explain the situation fully. That this snake is likely very ill, has not been fed or cared for properly and was basically dumped on you suddenly. Some vet clinics will work with you on keeping costs reasonable, some clinics even have programs for lower income pet owners so ask politely if they offer anything like that. If you can't find help and don't want to post your location publically, please PM it to me (just city and state) and I'll see if I can help you find some options.