You would also be giving it a much needed home so check in your area for a reptile rescue center. It is also important to note that the food and other supplies needed usually far exceed the cost of the snake itself. A conservative breakdown of cost can be seen here . The amount frequency of meals is dependent upon the size of the snake. Snakes under 3 feet generally eat prey the size of an adult mouse 1 to 2 times per week.
Larger snakes take more or larger prey less frequently.
Different species of snakes also eat different types of prey. You can find more specific diets here. No special supplies needed outside of housing and feeding requirements. A snake that is bright, active and alert. Clear saliva and a pink tongue and oral cavity.