Groupon offers the Jillian Michaels Vinyl Kettlebell Set for $39.99. Coupon code "JUMBO3" cuts that to $35.99. With free shipping, that's $2 below our mention from two weeks ago and the lowest total price we've seen. (It's the best price now by $34.) This set includes a 5-lb., 10-lb., and 15-lb. kettlebell, an instructional DVD, and integrated wrist band. Deal ends January 21.