Problem with Google's Buy Now buttons

Over the weekend I decided I was going to update my band's website - www.thereverseengineers.com with Google Buy Now buttons but found out that shipping is not currently being calculated with the Buy Now buttons. This is a very important feature of Paypal's service, Paypal allows you to specify shipping costs...Google states in their Google Checkout site that the feature is not included yet. Looks like I'll wait to change over to Google's Buy Now buttons.