Join. You will be amazed. The free Amazon shipping alone for an entire year more than pays for the membership, and you get insanely more movies and TV shows than you’ll EVER find on Netflix, many or most of them free.
I second that. Amazon raised the price from $79 to $99 earlier this year, but considering the free two-day shipping you get on anything purchased through prime, plus movies and TV shows, I think it's still a good deal.