Allow notification for upcoming early release/full ebooks

I was looking at "Version Control with Git, 2nd Ed." which is due out in July. There's a button to push to preorder the print edition. I'd like another button allowing me to either preorder the ebook, or to be notified when an ebook (early release or complete) is available. I would certainly use such a button frequently.

Possible? Likely?

- Scott
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