My goodness, would you look at that! Luckily the paperback is only 1% the price, so solid deal there!

I thought it's a data entry error, but no, it looks like that's the legitimate price range for the NEW hardcovers (the actual listed ones are even more!):

https://www.amazon.com/gp/offer-listing/B0007JVUSK/ref=dp_ol...

It's either a ripoff, or some sort of collector's edition original versions. Though if it were the latter, I'd have expected it to be advertised as such.