Focus Camera offers the Monoprice 1,000VA 500-watt Rack-Mountable Uninterruptible Power Supply Battery Backup, model no. 104153, for $109.99 with free shipping. That's $134 off list and the lowest total price we could find. It's designed primarily for audio/video home theater systems and features an LCD diagnostic display panel, coaxial surge suppression ports, phone and Internet surge protection, and automatic voltage regulation (AVR).