>>There are promotions on Best Buy for 2GB of memory. He wants to buy one and I have hard time convincing him that 2GB is not enough. 4GB costs ~150$ more.
>
>Why are you trying to convince him? Haven't you learned the favorite female expression "I told you so!" <bg>

Since it would be spending our money, I don't like it.

When I go to a store, I would mostly buy the things which are on sale. When he goes to a store, he will buy stuff he likes regardless wheither it's on sale or not.