Itzaflash offers the REVO 4-Channel 500GB DVR Security System, model no. R4B4DCMB-5G, for $398 with free shipping. That's the lowest total price we could find by $152. It features 4 REVO Quick Connect RJ12 night vision cameras (night vision distance up to 33-feet), 10.5" built-in LCD display, and 500GB hard drive storage. Deal ends December 9 at 11 am ET.