You can order or buy the phone from anywhere and all you have to do is register it to get the 50% off code. Register here - http://www.samsung.com/us/support/register/product
The thing which sucks is back when Samsung released the Note 2, they had the same offer. However, a month or so after the Note 2 came out on Verizon, they upped the offer by adding that if you registered on the Samsung website, you got a free flip case. Of course, if you had already registered, you didn't get the free case.