This week I was searching for how to order Nexus One sitting in India. Initially when I started doing it, google recognized my IP and tracked it down to India and gave me a message stating “Sorry the phone is not available in your country”. Disappointed I started looking for sites where I can get a secure proxy server so that I can route my request to the google site through a proxy server. Secure because I would be doing a money transaction. This site can be used for doing so. http://www.proxz.com/subscribe.html

Then once you do that you will need to configure your browser to use this proxy server. This is pretty much illustrated in this post.
Once you are done, you should be able to purchase it. But the hitch here is you will need to specify a US address. This you will need to figure it out or if you don’t have any US address u can subscribe to MyUsMailBox. This company will give you a US mailing address and once the consignment reaches there, they will ship it back to your place.

Detailed Reference from where I got the information can be found on this link http://www.yugatech.com/blog/gooooogle/how-to-order-the-google-nexus-one/