I just found this blog post talking about the offer. I am going to try it. If you have tried before, could you please let me know is this real?
blog link http://giri25.blogspot.com/2008/05/save-10-using-google-checkout.html

hey pops, i tried to use google checkout once to buy a hard drive from buy.com but instead it put some huge tax on the product and it didn't make sense to buy through google as I wasn't saving any thing. check to see if there is tax imposed on your product at checkout...if you are buying something under $50 it might be a good idea since the tax might not be that high.

This is old news! :)  I have used it before.  It works!  Plus, you can keep registering new gmail account and keep using this $10 off. :D

this is very old news.  i have used couple of times.  however, i have not used recently.  they will track your phone no, email id.  so, once you take 10 bucks off, next time it might not work.  it worked me for at least couple of times.

It's not a old, I used about a month ago to buy an IPOD. I did google checked out and saved 10 dollar.

 

I used it and worked well for me.
Thank you for your entries guys.