options
the word vivarium is pretty broad and almost any amphibian can be housed in one, many reptiles can also be housed in one. as far as cost, there are a lot of things to consider, is it going to have any water feature(s)? what kind of animal is going in there, what kinds of plants are you going to use, are you going to make a background, and if so, how? ect. if you give me a general idea of either what species you want in it, or what you want it to look loke. i would be glad to help, and please feel free to ask questions. good luck!