For a mouse, we really like the Designer Appliances E Quill AirO2bic mouse ($90), used with a TrainerBall Mousepad ($10), which includes suggested ergonomic exercises.
Amazon.com Price: (as of 2018-06-20 22:35:23 GMT)
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195011 Features: -Trainermat mouse pad. -Made of quality non-slip, eco-friendly material. -Great for at home or the office. -Long-lasting and durable. -Dimensions: 12” H x 3” W x 3” D.