What's deterring me from pulling the trigger on the Scheme version is the price. CAD$87 seems a bit steep for a paperback edition that's almost 30 years old. The JavaScript version is CAD$20 cheaper.
Even having them ship it to you will probably be cheaper than that CAD price. It's unfortunate the price has shot up so much, I guess I'll be taking very good care of my hardback edition.
https://mitp-content-server.mit.edu/books/content/sectbyfn/b...
Used books are awesome. I have north of 500 books and I doubt more than 50 were purchased new. Only that many because some of my relatives want Christmas and birthday wishlists every year, but won't shop anywhere but Amazon and think it's weird to buy someone a used book as a gift (I'd rather have 2-3x as many books for the same money, but hey, I'm not the one paying, so whatever, I guess).