How about the possibility of a b/w print hardcopy with a downloadable color e-book/pdf version?
If I had it my way, all of my reference books would come that way. Hard copy for browsing and keeping on the bookshelf in my office and digital version to have available when I'm on the go. There are a couple of instances where I've even purchased one of each (at full price) just to be able to do that. The problem usually is that the publishers are so afraid of getting ripped off that they opt not to produce the e-book version at all, which I find to be a lamentable solution to the piracy problem.
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