I get a bit nervous when ordering something that ships directly from China. Notice if you buy it you have to pay for return shipping if it does not work. If it works great, if not you may be out $13.
Page 14 has a link to this model that looks like it is OEM.
http://www.aliexpress.com/item/hot-sale ... 78821.html
The challenge is getting the camera to show up on your cars screen. You may read this whole thread if you have time it has good info on 2 different approaches to get this to work.