Well, you're free to make a small donation now and order the book from Amazon (for ~$20, I expect) in a few months. I know it's not psychologically the same thing, but the end result is similar.
We always do 40% off pre-pub offers that includes the print book and DRM free ebook versions (pdf, epub, and mobi). Just give us your email (nostarch.com) and we'll send those to you. Maybe we should launch that offer now.