Bestbuy offers Bowflex - SelectTech 840 Adjustable Kettlebell - Black for $99.99 (orig. $149.99) free shipping.

Product Description:
Reap the benefits of variable strength training with this Bowflex SelectTech 840 kettlebell. The single adjustable weight replaces six kettlebells and provides resistance ranging from 8 to 40 lbs. in a convenient space-saving design. A twist of the dial on this Bowflex 840 kettlebell lets you change the desired weight as you follow along with instructional videos or workout on your own.