tub will cost like 5 dollars and keep heat and humidity way better than a glass tank. plus you can use that tub in a rack system if you go that route later, the most expensive thing is a thermostat they range from 50-140ish dollars. heating you can get flexwatt for a few dollars and solder on a cord. water bowl and possibly, a hide. temp guns are pretty cheap 20+ dollars. bout all you need.

what left is the cost of the snake and the cost of the food