Groupon offers the Logitech Clip-On Speaker for Apple iPad, model no. 984-000193, for $15 plus $3 for shipping. That's $2 under our mention from three days ago and the best price we've seen. (It's also a current price low by $2). 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 8 at 1 am ET.