ATTENTION: Don’t get screwed.
The base price of the book is $14.99, or $4.99 for the ebook. Some minor variations may occur in your own currency, but by no means should you have to pay just south of 50 euros. I’m not that crazy.
Due to some confusion, I’ll make it simple for you:
International buyers, you should be able to manage with your local Amazon – Dutch buyers, try or me directly.
Alternatively, select the book option from the Buy Stuff pulldown menu for marginally more information.

Or, if you’re feeling particularly nutty, go to either the EU corner of Spreadshirt or the US version to buy stuff that seemed like a good idea at the time. Select the Merch-page from the pulldown to do your shopping (EU) right here.