You can buy a pvc cage if that's what you like but I have found, over the last 3 years, that one leads to two leads to three, etc, etc... If I were you I would build/buy a rack system. You can get a three tub adult ball rack for around 300. Or you can build one and save the scraps for another build when your collection grows. Fighting space is always a battle when you fall in love with your animals and rack systems are the best way to maximize space. Start planning ahead so you don't do what I did and go from one tank to six then realize that you would have saved money by just buying or building a rack in the first place.
I hope that helps.