You bastards! You fucking bastards!
HBO NOW is an Apple exclusive for now (starting in April, when the next season of Game of Thrones comes out) for Apple TV, iPads, and iPhones. Who knows when Roku, Amazon Fire, and Android will get it.
$15 a month (not bad pricing).
I wonder if the app will have Chromecast support (as HBO Go does). If so, that makes it more palatable. I don't want an Apple TV, but an iPad Mini wouldn't be a bad investments as my 2014 Nexus 7 is somewhat struggling with Lollipop (maybe I need to do a factory reset - but it is more likely the slowness is caused due to desperately running out of space).