The authors of The Sovereign Individual were ahead of their time. You can buy a real copy, that can't be "unlicensed" by Amazon, and pay with bitcoin: https://satwize.com/product/the-sovereign-individual-by-james-dale-davidson-william-rees-mogg/

Nik Bhatia's "Bitcoin Age" is now available on satwize, but ONLY if you are willing to pay with bitcoin: https://satwize.com/product/bitcoin-age-by-nik-bhatia/