- APC 425VA Battery Backup Surge Protector for $40
APC Back-UPS 425VA Battery Backup and Surge Protector for $40.
It's fairly heavy at 5¾ pounds, so the free shipping is nice.
A battery backup (uninterruptible power supply) keeps computers, monitors, routers, DVRs, switches, and fish tank filters running during a power outage.
This 425VA model can safely protect about 225 watts of equipment.