NetDirectBargains via eBay offers the open-box Logitech S715i Rechargeable Speaker System with iPod Dock, model no. 984-000134, for $79.99. With free shipping, that's tied with our expired mention from two days ago of a refurbished unit and $35 under the lowest total price we could find for a new, factory-sealed unit. This speaker system charges your iPod or iPhone while playing content off your device via the integrated dock. It's also compatible with various other MP3 players and smartphones via its 3.5mm input. The included rechargeable battery offers up to eight hours of music playback.

Note that this item ships in non-retail packaging and may have minor scratches.