Woot offers CyberPower 1000VA/600W Intelligent LCD UPS System with AVR, and LCD (CP1000AVRLCD-R) (Certified Refurbished) for $99.99 free shipping with Prime. 

Product Description:
A mini-tower UPS with line interactive topology, the CyberPower Intelligent LCD CP1000AVRLCD provides battery backup (using simulated sine wave output) and surge protection for desktop computers, workstations, networking devices, and home entertainment systems. The CP1000AVRLCD uses Automatic Voltage Regulation (AVR) to correct minor power fluctuations without switching to battery power, which extends battery life. AVR is essential in areas where power fluctuations occur frequently.