From the nerdgirl page comments:
"Many thanks to Caroline Wong from the amazon forums for giving a hint to the solution. Amazon is now checking the IP address for those without a valid one-click payment option - generally those purchasing with gift certificates. You need to do a VPN to a US ip address - just do a google on "VPN to US" and download the software. Just run the software before any amazon session. Just bought 3 kindle books of amazon using gift certificates."
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