Yeah, after the initial equipment costs snakes are pretty low-maintenance. Other than my obsessive need to Make Things Better(TM) I haven't really spent much since I bought her rats for the year. After the new tub lid is installed and the Arcadia bulb is up and running, I probably won't have to* buy anything (except substrate) until it's time for a rat refill.
*But I will anyways because I can't stop myself lol. Self control is low, impulsiveness is high.