The Motorola i1 will be available for purchase through Boost Mobile retailers, Best Buy, and Best Buy Mobile starting June 20th.  Pricing is unknown as of right now. Full press release is below:

The Motorola i1 has been announced to arrive this summer. This device will be the first Android push-to-talk smartphone. Other specs include 3.1″ HVGA display, 5 megapixel camera with auto-focus, dual-LED flash, WiFi, Bluetooth 2.0, and a 2.5mm headphone jack. For typing there is a Swype virtual keyboard. [BGR]