Naipo Direct via Amazon offers its Naipo Muscle Roller Stick for $14.99. Coupon code "Naipo604" cuts it to $9.89. Plus, Prime members bag free shipping. (Non-members can spend $49 or more to qualify for free shipping; otherwise, shipping adds $7.09.) This 18" massage stick features nine independent ABS plastic rollers on a steel rod core. Deal ends January 10.