Logitech has the Logitech Rechargeable Tablet Clip-On Speaker, 997-000213 (new, dented box) for $20. Add two to cart to reach $40 - $10 off with coupon code logi_tabs_12512 [Exp 12/8] = $30 with free shipping. $20 minimum required for free shipping; $6 shipping for orders under $20. Features 3.5mm audio jack, eight hours of battery life, and USB to mini-USB charging cable. Normally around $17 each.
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