I'm doing one of my friend's 2 restaurants soon... I just ordered these:
http://cgi.ebay.com/CCTV-Four-Camera...QQcmdZViewItem

:dunno: The stuff came in today, I haven't gotten a chance to try them out. But my best friend bought his off of Ebay a while back and spend about the same...his work just fine. $5K is a ripoff.