How can you get a fennec fox?

Simple. Get one from a store or capture one.

In the United States and Canada , there are good breeders. Here is a link to a directory:

http://www.fennecfoxes.net/breeders.html They sell from $800.00-1500.00

You must consider that buying wild animals as companions, is generally not the best idea. Adopting an injured fennec fox is a better one. Of course, you would need a license.