I was going through the grocery store and found a ficus in the floral section. It was a couple of bucks and now is about 25 years old, and not a bad tree. The grow fast enough and take indoors better than most. While the other trees get infected with spider mites, etc., this one never has a problem.
Find a local gardening store, get a cheap ficus, and don't do the online ripoffs. You know what the tree in front of you looks like, from every angle. You don't know what you will get mail order.