Zero is available at:
    Amazon.com
    Barnes&Noble.com
     Buy.com

UK Edition:
    Amazon.co.uk

Auf Deutsch: (Zwilling der Undendlichkeit, Berlin-Vlg.)
    Amazon.de

En Français: (Zéro, la biographie d'une idée dangereuse, Lattes)
    Amazon.fr

(Also available in Japanese, Italian, Korean, Chinese, Turkish, Finnish, and in other languages, as well as as an audio recording in English.)