I have had them for about 5 years now and cost was about $1k per. Also, there are monitoring plans that can be purchased too where they will let you know if an event has happened and send you the footage instead of you downloading it yourself. Prices may have gotten more reasonalble since my purchase. Even if still $1k, that might be equal to about 2 of your CO deductibles and might save you even more money like it has me. Of course it is transferrable from vehicle to vehicle once you trade in your X. Google it and read up on it for more info.

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2010 Lexus RX350 still new
2003 BMW X5 3.0i w/sport package w/68K miles. (gone Thank God!)
2002 Dodge Ram 2500 4X4 cummins diesel w/198K miles, custom repo truck
2009 Scion tC w/46K miles
2007 Suzuki SV650 custom streetfighter
2000 Lexus GS400 w/165K miles