If you want to stream movies & TV shows online (and don't need DVD rentals), you can join Vudu for free and not have to pay for any monthly membership. The free Vudu membership lets you watch 1,000s of movies for free with ads. The ads are sometimes a bit disturbing but usually not too bad. If you want to watch movies without ads, you'll need a paid membership.
You can watch unlimited movies & TV shows with a free Vudu account.