Staples offers the APC Back-UPS 650VA UPS Battery Backup, model no. BE650G, for $39.99. Opt for in-store pickup to dodge the $9.95 shipping charge. That's tied with our Black Friday mention (which included shipping) and is the lowest price we've seen for any 650VA (or higher) UPS. (It's also a current price low by $35.) Sales tax is added where applicable. It features four battery back-up outlets (and a total of eight outlets), USB connectivity with PowerChute software (for Windows only), a 340-joule rating, and more.

Of note, Office Depot has the APC Back-UPS ES 350 350VA UPS Battery Backup, model no. BE350G, for $49.99. This $25 mail-in rebate cuts it to $24.99. With free shipping, that's the lowest total price we could find by $19. Sales tax is added where applicable. Rebate ends February 25.