It's $58 to order the watch from TI. I've seen some deals go as low as $24 on other websites. I wanted this because I had a minor moment of panic when my iPhone started flaking out on me. This would be a small price for me to pay for a peace of mind.
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[ 2.5 ms ] story [ 14.2 ms ] threadSimilar implementation for the Pebble watch:
http://abl.github.io/pTOTP/