I got mine off of eBay for $124.99. Looks like the price dropped a little since then. I purchased from this same seller. Shipment was fast and product was as described.
http://www.ebay.com/itm/Rydeen-ZH07-...item4173df2996
Don't forget, if you're connecting to the factory Head Unit you need to get the wiring harness from this guy. It's only about $20.
http://ae64.com/Rear-camera-16-pin.htm
After you have both the wiring harness and the camera you can take your car over to BestBuy. They charge $75 for installation, but it does come with a warranty and they did a great job with the install.