The rearview mirror on my 98 gtp developed a bubble in it. Anyone know where I can find a replacement, preferably with a compass in it?

eBay! Gentex brand

That's funny, mine did the same thing this past week, and the auto dim feature stopped working. It seemed to be related to the heat/humidity. I've talked to a couple of my dealer buddies, and they say that the compass feature is controlled by the BCM, so it would be more trouble than it would be worth to try to swap an OEM style with compass in. Maybe the aftermarket one mentioned above has a stand-alone compass that would circumvent that issue.

get gentex brand!! look at the back of the mirror and make sure it doesn't say Donnelly! Gentex makes quality mirrors, but they can be a bit pricy!! i got a couple myself!