Dell Small Business offers the APC Back-UPS 350 350VA Uninterruptible Power Supply, model no. BE350G, for $49.99. Coupon code "01K1MLGX4JL704" cuts it to $39.04. With free shipping, that's the lowest total price we could find by $7 (outside of the price below). It features three protected outlets. Deal ends September 20.
A close price: Amazon has it for $39.99 with free shipping.
See all Dell Coupons.
Update: Specs corrected.