Updated. Through 5/18, Bowflex.com takes 40% off the Large Universal Kettlebell Kit via code DAY2, dropping it to $71.40. Kettlebells are simple and versatile, so this set can help with cardio, strength, and stretching routines. Since it comes with 10, 15, and 20lb bells you can do several workouts based on your fitness level. It also comes with the stand and a workout guide. Shipping adds $21.99 and sales tax is charged in most states.