This system just came on sale at Costco.com yesterday. A 250 GB motion sensing triggered digital video recording system with four weatherproof color cameras with infrared LEDs. Cost: $299.99 shipped, sale ends Dec 10. Also comes with Costco's great unlimited return policy if you're not happy for any reason..
http://www.costco.com/Browse/Product.aspx?Prodid=11238977&cm_mmc=BCEmail_248_US-_-Electronics-_-61-_-QSeeMotionDVR_BCEmail_248_US