Nope. HBO didn't renew their contract with Netflix. Been a while now since it's been available anywhere other than HBO, unless you want to buy it via iTunes or Amazon.
Weird. Just looked and all 6 seasons show on ‘flix here.
I’m special!
If that's the case, they must have recontracted for it. There was at least a period of one year when it was not available on Netflix. Glad to hear it. Maybe I'll subscribe to Netflix again just to watch it through again.