Right now, you can purchase refurbished CyberPower battery backup systems starting at $42.99 from Woot.
For example, check out this CyberPower SL75OU-R battery backup for $59.99. Compare that to $89.99 new at Best Buy for a savings of $30.
Among the other choices available, you have this CyberPower CST135XLU battery backup for $89.99. Compare that to $99.99 for a refurb model at Walmart.
See the full list of everything available here.
Shipping at Woot is free within the contiguous 48 states for Amazon Prime members, or $6 without membership. This deal will only last through April 27 and can change at any time.
Why I Dig this Deal:
These are a great solution if power fluctuations are frequent where you live.