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Logitech ERGO M575S trackball drops to $39.99: Better model, lower price than its predecessor

Logitech ERGO M575S Wireless Trackball Mouse drops to $39.99 at Amazon -- 20% off MSRP. The ergonomist-certified trackball ...
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36 gadgets, gizmos, and contraptions that will make you go ooooh when you find out they exist

Three words: Disco. Ball. Diffuser.