My company bought the books for me. Everyone was able to order books for the value of around 100 euros, and I ordered TAOCP because it is almost timeless and it will be valid for long time. I never buy programming books (books like &quot;learn XYZ in XYZ days&quot;) in paper because they get outdated so fast, but getting TAOCP practically for free, I did not give it a second thought..