Tenker via Amazon offers its Tenker Cordless Shiatsu Massager Pillow for $54.99. Coupon code "K47AMOFM" cuts it to $39.99. With free shipping, that's $25 off list and the lowest price we could find for this FDA-approved pillow. It features a rechargeable 2,000mAh battery and 30-minute auto shut-off function. Deal ends July 31.