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: $83.83 (as of 2018-08-16 02:26:30 GMT)
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The Quill patented Grip-Less computer mouse has an integrated Wrist Guide that maintains the hand, wrist and arm in the most optimal position providing for lowest physical (biomechanical) load. This is a position in which you are able to perform work while in a ”Neutral” or near resting posture.