Best Buy offers the APC Back-UPS 650VA UPS Battery Backup, model no. BE650MC, for $39.99 with free shipping. That’s $15 under our September mention and the lowest total price we’ve seen for any 650VA (or higher) UPS. (It’s also a current price low by $28.) 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.