First, the screen is a DV Media M3 Pop-up screen for Mazda 3. It fits 2004 - 2007 (2008 models haven't hit the showroom yet so no word on the 2008). Here is a link to a site that sells them: http://thexenonstore.com/mazda3_screen_info.php
I purchased my screen from a local importer here in Tampa (who also happens to sell them on eBay, click here to check out their eBay items)
. This screen is the definition of plug-and-play in terms of ease of installation. Taking just two screws off the factory dasy and swapping vents this screen was nearly ready to go. What about the wiring? That was even easier. It comes with a harness that takes your factory radio plug and creates a pass through cable so the factory plug powers both the radio and the screen. Once I saw how easy it was to install I skipped the car-audio shop.