|Other Retailer||Price Checked Time||Their Price in AUD||Our Price|
|Amazon UK||2 days ago||44.62||$29.57||You save $15.05|
|Amazon US||4 days ago||40.19||$29.57||You save $10.62|
|Book Depository US||today||29.66||$29.57||You save $0.09|
Conrad Barski has an M.D. From the University of Miami, as well as nearly 20 years of programming experience. Barski is a cartoonist, programmer, and the author of Land of Lisp. He's been using bitcoins since 2011.Chris Wilmer holds a Ph.D. in chemical engineering from Northwestern University and is a professor at the University of Pittsburgh. Wilmer's first purchase with bitcoin was a bag of honey caramels from a farm in Utah. They were delicious.