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That's definitely a good technique to save money but always have something to watch.

Well, I am paying the 12 bucks a month for netflix so it is not free.

No but if you're paying for Netflix Amazon HBO at the same time then you'd be paying something like 40 bucks a month. When only paying for one at a time, you don't have to use them all at once and therefore you will save money. Nothing is free in life.