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Amazon has the 'let the publisher know I'd like a kindle version of this' button.
My guess is, for most of the books, the hold up is tracking down who has the rights to the book and then negotiating them.
Zelazny is famous enough and still selling well enough, that his rights are probably easy to locate, if not so easy to negotiate.
But that's not true for a lot of authors. Tracking down who owns the rights to a series of modestly successful books from the mid-80's is probably a whole lot more expensive than getting the books ready for production. And if the original author is dead... that's even trickier.
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