Google Editions is going to let their partners offer HC+ebook bundles, from
Getting started with Google Editions
Quote:
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Google Editions Bundle Price: When Google Editions are available to consumers, retailers may choose to sell your Google Editions book in a bundle with the print copy. This setting allows you to specify the percentage of the Google Editions list price that you would like to charge when the print and digital editions are sold together.
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I don't know if 0% will be allowed, but I can't see why not.
If Google Editions does this, Amazon and B&N won't be far behind.