Meritline offers the open-box Logitech S135i Portable Speaker with iPod Dock, model no. 984-000109, for $30.95. Coupon code "MLC61B3CNL1" cuts it to $24.95. With free shipping, that's $25 under the lowest total price we could find for a new, factory-sealed unit. This speaker system supports all iPhone and iPod models via dock connectors, as well as other MP3 players via a 3.5mm jack. Coupon expires after 100 uses.

Of note, a 90-day warranty applies, although it's unclear who backs it.