question about P90X

I'm thinking about starting P90X.  For those who have done it in the past or who are currently doing it, how much equipment is necessary.  I think if you order it you just get the DVDs.  I have some dumbells and a barbell.  Will I need to buy a bunch more equipment in order to follow along with the DVDs?

Thanks!

You need either:

- Dumbells

- Pull-up bar

OR

- Resistance bands

- Door extention.

You can use the resistance bands + door extention in place of the pull-up bar if it's cheaper, or use it in place of dumbells. :3