eBay has the Netgear Arlo 5-Camera HD Security System (VMS3530-100NAS) for $350 with free shipping. List price: $600. It features real-time email or app notifications and night vision.
eBay has the Zmodo Wireless Security Cameras w/ 1TB HDD (ZM-KW1002-1TB) for $99 with free shipping. Features include 2 indoor cameras, 2 outdoor cameras, motion activated recording, night vision up to 50 feet.