APC Back-UPS ES 550VA UPS (updated)

Best Buy offers the APC Back-UPS ES 550VA UPS Battery Backup in Black, model no. BE550G, for $39.99. Shipping adds $6.99, or opt for free in-store pickup. Even with shipping, it's the lowest total price we could find by $3, although we saw it for $9 less in September (since expired). Sales tax is added where applicable. This 330-watt battery backup includes system shutdown software. It's a high-efficiency charger that optimizes power use for global environmental standards and uses recycled packaging.

Update: This item now receives free shipping.