https://computers.woot.com/offers/cyberpower-cst135xlu-battery-backup-20?ref=w_cnt_wp_5_7 CyberPower 10-Outlet 1350VA 810W UPS Battery Backup (CST135XLU, Certified Refurbished) for $79.99. Shipping is free for Amazon Prime Members (must login with your Amazon account and select a shipping address in order for Woot to apply free shipping) or is otherwise $6 per order.