You can save $10 when you buy something from buy.com and have google account. If you dono have google account(gmail email ID) sign up for this and get $10 discount. They give discount for each email ID one time. I know some friends creating fake gmail account just for this purpose and saving more money. But according to my friends when they(buy.com) found this, they won't allow you for the discount. They can check the shipping address and billing address.
Any way at least you can save $10. Try it out. Yesterday I purchased a new xD picture memory card for my camera and saved $10.