In your account at mydish.com in the store option if you have a 722 on the account already. If not, when you upgrade they can add it to the order. Or you could also check local retailers.
Jerry, we can add that to the order in our system in the work order is still open and if it is closed we can send one to you through our system. The sling adapter is 49.99, and if you would like to set that up send us a private message.