You won't be able to buy HBO Now directly from HBO
Don’t plan on buying an HBO Now subscription straight from HBO — it doesn’t currently plan on selling them. Instead, HBO tells us that you’ll have to sign up through one of its partners. Apple was announced as a partner last week, and today New York-area cable provider Cablevision is being announced as its second. Cablevision said this afternoon that it will offer HBO Now to its Optimum internet and Wi-Fi customers, making it the first cable provider to announce such plans. No other details are being announced, however: that includes when you’ll be able to get it, what it’ll cost, and how exactly it’ll work. HBO Now is supposed to launch in April, ahead of the the season premiere of Game of Thrones.
Source:: The Verge