Google is offering unlocked Nexus phone for the direct sales to registered Android developers for $529.00. Even though Google has stop selling the Nexus phone but still you like to experiment with it this is a great chance. To see the details or order a phone, you need to sign in to your Android developer account and click on the "Development Phones" link.
The Nexus One combines an up-to-the-minute platform (Android 2.2), modern hardware, and the pure Android software suite. It's a good choice both for people who want to build Android applications using either the SDK or the NDK, and those who want to experiment with modified versions of the Android platform. Note that the Nexus One still ships with Android 2.1 but will download 2.2 soon after you turn it on; make sure you’re near a fast network.
Android Developers Blog: Nexus One Developer Phonels
