Lots of the cheap asian sourced ones do, often on a 4 pole 3.5mm connector.
A friend uses one as a security camera monitor, since when he had one that was a TV and DVD player the staff always were putting it on juice instead of watching the camera like they were supposed to. Even tho you would expect audio on a 3.5mm plug, there was no audio input via that, but it did have another 3.5mm input, but would only pass that thru to its FM transmitter along with the GPS audio, not play the inputted audio out the speaker. But you dont really need audio for the reversing camera feature.
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