This was emailed to me. I don't know if it applies to anyone.
It is also reuseable.
Dear Valued Customer,
As part of our commitment to continually improve your shopping experience at Buy.com, we'd like to let you know we now offer Google CheckoutTM. Even better, all purchases of $30 or more (before S&H and tax) completed with Google Checkout throughout October will get an automatic $10 bonus!
If you’ve used Checkout before, you can make convenient, secure purchases from us simply by entering your Checkout username and password. If you’re using Checkout for the first time, you only need to fill out one page of information to complete your purchase. And you can shop with confidence knowing that Google will protect you from unauthorized purchases should they ever occur.