Cost of the replacement is all based on the vehicle. 890 is very high for aftermarket, so Im guessing that quote is for factory glass. If your paying out of pocket, it's definitely cheaper to go aftermarket. Unfortunately, modifying your mirror to come off your roof would be something you'd have to fab up. they wouldnt do that for you...but they can take the metal button off the glass so it doesn't crack there again.thank you for the help / advice! so if i need to get it replaced (looking more and more like it all the time... ugh) would i just ask the repair place to mount my mirror to the roof or headliner or something like that? its illegal here to drive without a center mirror. but thank you for the help though! now to just find a place that can replace my windshield for less than 890 dollars...