dvd orders
 

Where is the cheapest, but best place to buy and pre-order DVDs?

If you know how to use Columbia House properly, that's the way to go. Otherwise I would say deepdiscountdvd.com

deepdiscountdvd.com has been really good to me. best prices, fast service.
I was/am a member of CH too, but I'm not a big fan.

The DVDTalk forums have some great info if you want to go the Columbia House route.

Here is a crash course in Columbia House for newbies.

Here is an in depth FAQ that can handle most of your questions.