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Belmint TENS Electronic Pulse Massager [rakuten.com] $ 16.90 + free shipping
(Transcutaneous Electrical Nerve Stimulation)

Use promo code REWARDME for an added 5% in Rakuten Super Points to spend later

More info:
Amazon Reviews [amazon.com] 4.7 out of 5 (currently $ 24.99, lowest $ 18 on camelx3)