BuyDig offers the Night Owl 4-Camera DVR Security System, model no. S44245NHD, for $129. Coupon code "DIG5" drops it to $124. With free shipping, that's tied with last week's mention as the lowest total price we've seen and a current low by $55. It includes Ethernet connectivity and is compatible with select mobile devices (including the iPhone and Android 2.3 or above devices) for remote viewing. It does not come with a hard drive but can support up to 2TB of storage.
There are many ways for seniors to get cheap -- and even free -- entertainment and services.