Jessica, AED are now mandatory in fitness facilities.
I purchased my Phillips AED through Stork Medical two years ago. It was pricey. If you want to visit their website you can go to www.storkmedical.com They were very pleasant to do business with.
Hope this helps.
Investing in a home AED in this situation is a wise decision. The cost is nothing compared to the loss of a life in your home on your watch. I would definitely buy one. And check into ADA and other possible state and federal tax credits for purchasing one. I know there are many such credits and incentives for such business purchases.