Yup. Common. The auto parts store has it.
Funny.. I was just thinking on the way home from work, "every center mirror in every vehicle i even owned, the mirror fell, except this one.." And Bam, a post about it.. So that means mine will fall off tomorrow now.
Super glue will work for a while and in a pinch.. But will last any where from a week to 2 years. If you have it, Try it.. worry about it if it falls off again. (scrape clean. Alcohol clean. stick on) Just saw a show on myth busters, 1 drop held 600 pounds. lol. it was interesting and they moved on to a dozen drops ( i think ) and it lifted a car(big old station wagon)
MythBusters: Super Sticky : Video : Discovery Channel