It is awesome to know that you have the space for them. I would say then go for it. If you have the financial backing, experience, and a place large enough for them then its not that bad of an idea. Just make sure you do all of your research about husbandry well ahead of time and make sure the cost won't be more than you expect it to be to run and maintain it. Most marine aquatics stores can order them for you. I even have a place here in Merced aka the middle of nowhere in California that can order elasmobranchs for me. So just start looking around stores near you and I'm sure you'll be able to find one.