NetDirectSales via eBay offers the Logitech Clip-On Tablet Speaker, model no. 984-000193, for $19.99 with free shipping. That's a buck under our mention from last week and the lowest total price we could find by $6. This speaker features a rubberized clip that attaches securely to your Apple iPad or other tablet with a 3.5mm audio output. Deal ends July 31 at 5:23 pm ET.