Yes, you're right, $289 from costco. The dell one is $259 and it's today only
Days of Dell Deals shipping is free from Dell.
The microphone is wired. I ran it under the dash and tucked it under the rubber liner of the door opening.
The mount comes with the 360. It's suction mounted on to the face of the stereo. I enclosed the power cable and mike cable with some black cable wrap for a cleaner look.