How much would tarantula care cost?

no including the tarantula or the tank and lid. Also at my pet store they had a small one that i wanted. It had to be either a curly hair or a rosea. Now it was $25. Any ideas which one was it? It had a sponge in the water dish also. But did they do that cause but like humidity. Cause i read that one like more humidity than the other. I just like to know which one was it.