It depends. As others said, w/the shipping and handling, it adds up. But, if you have no DVDS and you really want to jump start your collection, you join, do the committment, and quit. Do the math to see if it is worth it. Do you really want all those movies? You can also borrow from the library. The library system is fabulous, you can request things from just about anywhere if the branch you use the most does not have what you want. I also found that the Disney DVDs in the stores are not that cheap -- $20 usually for new releases.
You can call in for the monthly committment, or do it online, or send in the mail thing. I was bad about that, and was glad to quit when it was over. I was not impressed with the offers when you became a premium member. (fulfilled your commitment.)