GM's aftermarket rearview mirror with OnStar FMV built-in is hitting BestBuy July 24th. Expect to pay $299.99, plus $75 for installation and $18.95 per month. The mirror will work in most vehicles and there is an online compatibility configurator here. Not sure how I feel about another recurring monthly bill, so over that type of thing, but automatic crash response, turn-by-turn navigation, and hands free calling are nice.