Right now (2/2/12) Amazon is offering The Smurfs for a 99 cent rental. I've noticed that these rock bottom rental prices don't always last very long. Today it is the Amazon Instant Video Deal of the Day. If you are interested I would get it soon.
If you haven't seen this movie you can read my Smurfs Movie Review.
If you haven't had a chance to try the Amazon Instant videos you can go to Amazon to learn more about How Amazon Instant Videos Work. You usually have 30 days to watch your rental after you purchase it and 24-48 hours after you start playing it to finish watching it. The "fine print" will be on the Amazon site.
Prices change all of the time. Double check the price before making a purchasing decision.