Two things that don't go very well together are being a Houston Rockets fan and a cable cutter. I would know, because most years I used to miss no more than five or 10 Rockets games per year. But, once I finally gave up on cable this became way harder.
Don't get me wrong, there are some really good options for watching the NBA online without cable. This guide covers a lot of those in detail. But, the biggest problem is watching a Rockets game, online without cable, from the Houston area. It's nearly impossible to do most nights, especially if you're trying to stay on the right side of the law.