Google published an update about "closing Nexus One web store," -- In this regard, Google says "This week we received our last shipment of Nexus One phones. Once we sell these devices, Nexus One will no longer be available online from Google. Customer support will still be available for current Nexus One customers. And Nexus One will continue to be sold by partners including Vodafone in Europe, KT in Korea, and possibly others based on local market conditions.
To ensure our developers have access to a phone with latest Android OS, Google will be offering Nexus One through a partner for sale to registered developers. Visit Android Market Publisher site and log into your developer account to purchase a Nexus One," stated Google.