Deal Frenzy via eBay offers the refurbished Samsung 4-Channel 500GB DVR Security System, model no. SDS-P3042, for $179.99 with free shipping. That's $69 under what you'd pay for a new unit and the lowest total price we could find. It includes a DVR system with built-in 500GB hard drive and four cameras with night vision, 72° wide angle coverage, and 720 TVL resolution.
A 30-day Deal Frenzy warranty applies.