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Yun Yue via Amazon [amazon.com] has 4-Piece ZEAGUS Metal Hand Grip Strength Trainers w/ Resistance Levels from 50Lb – 200Lb for $21.99 – extra 50% off when you enter promo code ET5FDSKQ at checkout = $10.99 ($2.75 each). Shipping is free w/ Prime or on $35+.