I have FIOS – and pay quite a bit to get HBO – it’s like you HAVE to buy the basic cable before you can extend it with HBO.
What is the cheapest way to (legally) get HBO ?
Try XBMC with plugins -
If you look into the site link below then the PsuedoTV plugin is useful for you as from the screenshot,you can see it displays HBO -
If you've Android ( phone only ),then XBMC is also there for it -
International Audiences Have Few Choices To Legally Watch HBO's 'Game Of Thrones'
The cheapest way to get HBO go
The cheapest way to get HBO Go is to have a friend or relative who has HBO and use their login/password for HBO Go. We've been doing it for about a year and it works great.
look for cable operators that provide cheap packages including HBO or get online access from HBO.