Ebay offers Refurbished CyberPower 1350VA/810W USB UPS System for $82.99 (reg $150) with free shipping.

Product Description:
A mini-tower UPS with line interactive topology, the CyberPower Intelligent LCD CST135XLU provides battery backup (using simulated sine wave output) and surge protection for desktop computers, workstations, networking devices, and home entertainment systems. The CST135XLU 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. Two USB charge ports (2.1 Amp shared) rapidly power portable devices such as mobile phones, MP3 players, and cameras.
Features:

• 1350 VA / 810 W
• Line Interactive
• Simulated Sine Wave
• 120 VAC ± 5% Output
• Plug type & cord: NEMA 5-15P, 6 ft. cord
• 10 × NEMA 5-15R Outlets
• 2 (2.1A shared) USB charge ports