Want to buy Google's developer kit for Project Tango, the tablet that can perform real-time 3D spatial mapping? Well you can't - not without an invitation, anyway. But for at least some of the applicants who have been invited to buy the Android-powered Tango tablet, the gigantic price tag is now a little more manageable. An Android Police reader passed along an email from Google offering Project Tango for $512, half its original price.

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