The cost to keep a pet snake varies, depending on the species. The biggest expense is generally the terrarium, including the necessary equipment for lighting and heating. You’ll spend anywhere from $30 to $200 to purchase one of the more popular species of pet snake and an additional $50 to $300 on a terrarium. Supplies cost anywhere from $100 to $300, depending on what you need. You should also factor in the cost of veterinary care when you adopt a new pet.