I am disappointed with the source I now have (not anyone that is on NAT)  for video equipment.  I am looking for a 12 volt monitor with at least 3 camera inputs.  Space is at a premium and this one would do the job with no additional equipment. 

http://cgi.ebay.com/7-Car-Stand-Alone-LCD-Monitor-4-Channels-Video-Input_W0QQitemZ110432302626QQcmdZViewItemQQptZCar_Video_Navigation?hash=item19b6473622&_trksid=p4634.c0.m14.l1262

It seems to get what I want in my price range, I will have to go the "roll your own" route.  I need some education on these systems.  Can I mix cameras with different lines of resolution?  Audio is not needed.  The price is so cheap that I can afford to throw it away, but a mistake will cost time that I really do not have.  This monitor is direct from China and I can not find out an approximate delivery date.  I am also looking for a close supplier to get cables, accessories, etc.  Any recommendations will be appreciated.