I've been a member of the Columbia House DVD club for years. Previously I compared buying DVDs on Columbia House as an existing member versus buying at Amazon. But I didn't look at the sign up deal you get with Columbia House when you first join.
When you sign up for Columbia House their normal offer is 5 DVDs for 49¢ each. But then you have to buy 5 more DVDs at regular club prices over the next 2 years. You could buy 1 of those DVDs for $14.95 when you sign up and then need to buy 4 more at regular club prices. Regular club prices are usually $19.95 and shipping on a single DVD runs $2.99 for the first movie and $1.99 for additional titles. So basically you're looking at:
5 DVDs at 49¢ each + 1 DVD at $14.95 = $17.40 up front
4 DVDs at regular club prices of $23 each = $92 over 2 years
Thats a total cost of about $109.40 for 10 movies or around $11 per DVD.
For comparison I looked over at Amazon and checked the cost of some popular DVD movies. The Departed was $13.49, Iron Man was $16.99 and Spiderman 3 was $13.49
So the DVDs on Amazon are typically around $13.5 to $17 each. I am not including shipping on the Amazon DVDs since generally their DVDs qualify for free shipping with orders over $25 so you could get free shipping if you by 2 DVDs at a time.
If you joined Columbia House DVD club as a new member then you would save about $25 on the purchase of 10 DVDs compared to buying them on Amazon.
In my opinion it is certainly a good deal to sign up for Columbia House as long as you're pretty sure you'd buy at least 10 DVDs over the next 2 years.