See the forum below :

http://www.dvdtalk.com/forum/forumdi...php?forumid=13

It provides a comprehensive guide of how to make the most of columbia house dvd club and some other clubs, by using their promo codes. Only useful for buying in bulk, but i did this recently and got 7 dvds for under $10 a piece including shipping!!!! it includes collectors editions, ultimate editions and the like.