Dell Small Business offers its APC Dell Back-UPS 1500VA Uninterruptible Power Supply, model no. DLT1500, for $479.99. Coupon code "EXTRA10" cuts it to $431.99. With free shipping, that's $138 off list and the lowest total price we could find. This 1,000-watt uninterruptible power supply features eight outlets and up to seven minutes of runtime at full load. Deal ends March 17.