Anybody have any idea which book from an sf author in modern times (say the last 40 years or so) has appreciated most in value? The reason I ask is that seeing an old fanzine ad for Dean Koontz's never-reprinted non-fiction paperback The Pig Society prompted me to do some digging on the current value. It originally sold at $2.95 in 1970 and is now valued at anything from $500-1000. That's some increase!

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