Walmart offers the Massaging Hoop Exerciser with Magnets, model no. 80-JF070, for $11.99. Opt for in-store pickup to dodge the $4.97 shipping charge. (Amazon charges the same with free shipping for Prime members.) That's $3 under last month's mention and the lowest price we've seen. (It's a current low by $8.) It purports to strengthen your abdomen and lower back and burn 100 calories in 10 minutes of exercise. Features include 21 massaging balls and 14 massaging magnetic balls.