Costco Sale: Zumba Shake Shake Shrink! DVD Kit $39.99 by Rhonda July 16, 2020 2/3/17. Shake, Shake, Shrink! was designed for weight loss with fun cardio and ab-toning workouts, simple nutrition plans and portion control containers. Costco has the Zumba Shake Shake Shrink! DVD Kit … 0 FacebookTwitterPinterestEmail