Sino-operation Company

I am looking for a supplier of a full 4 camera low light DVR security system for installing in cars. I need vandal proof dome cameras (or any like) with low light recording for taxi/mini cab installation. I am currently negotiating a contract for 80 systems with the possibility of 2500 to follow. This is an urgent request as the window of opportunity is small. Could you please let me know if you could supply such a system. I will need