Walmart offers the Gold's Gym Cast Iron 40-lb. Dumbbell Set for $29.99. Opt for in-store pickup to avoid the $5.99 shipping charge. That's $48 off and tied with our mention from a month ago as the lowest price we could find. Buy Now Features two 3-lb. handles four 2.5-lb. plates four 6-lb. plates Model: RSWB-GG040T-2