You can order here your copy of the book
Alternatively, below you can find a non-exhaustive list of vendors.
North America ...
Springer N.America   amazon.com   Barnes and Noble   amazon.ca
South America ...
Springer S.America
Europe ...............
Springer Europe   Springer UK   Springer Germany   Springer Switzerland  
amazon.uk   amazon.de   amazon.fr
Africa .................
Springer Africa
Asia ....................
Springer Asia
Oceania ..............
Springer Oceania
ISBN: 3-540-22213-8
"One More Reason": the author donates his royalties in full to charity