$18 on kindle

Thanks for the heads-up, I fixed the link to point to the Kindle edition!

Amazon has indeed gotten called out for these types of shenanigans in the past but that was a long time ago! https://en.wikipedia.org/wiki/Amazon.com_controversies#Diffe...

I missed this related discussion last month: The High-Speed Trading Behind an Amazon Purchase | https://news.ycombinator.com/item?id=13963743

$24 paperback, $31.95 kindle :)

$13.60 Kindle. That's a lot of variation.

$19.55 kindle for me

$21.22 from Lisbon