I bought one on ebay real cheap, was like $4 with free shipping, I got the one thats around 3-5ish ft of cable.

I also got a USB OTG cable for my phone so I can view it on my phone, theres an app called CameraFi i use, its proven awful handy for $4

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1982 300D (w123, "Grey Car")
1982 300D (w123, "Blue Car")
2001 Ford F150 "Clifford" (The Big Red Truck)
1997 Dodge Ram 2500 12V Cummins
1996 Dodge Ram 2500 12V Cummins
Previous Vehicles:
1995 E300D, 1980 300SD, 1992 Buick Century, 2005 Saturn Ion