Peerflix does not sell DVD's.
They only line you up with other people so you can trade your used DVD's for their used DVD's. My guess would be that all Peerflex does is send you a pre-paid shipping label. Who knows the condition of the DVD you get back.
Both the reviews here at RR were both bad and the WhoIs info says the website has been up since 2003. they also appear to be in Canada.
Quote:
Creation Date: 02-jul-2003
Expiration Date: 02-jul-2007
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Even thou I belong to Columbia House's DVD Club, I still think the best place to buy cheap DVD's is Target or Wal-mart.

Or you could check out
Newegg they have a pretty big DVD section, and the prices don't look bad. I've never used them for this thou and they only ship to the US.
http://www.resellerratings.com/seller2121.html Rating for Newegg 9.67.
EDIT:
Sorry, but you don't have your location filled out in your profile, so I have no idea where you are.