Walmart offers the Cap Barbell Rubber Hex Dumbbell 150-lb. Set, model no. SDRS-150R, for $179.99. Choose in-store pickup to dodge the $54.97 shipping fee. That's the lowest price we could find by $122, although we saw it for $5 less in February. It includes 5- to 25-lb. cast iron dumbbells coated in rubber to protect floors and equipment and a 2-tier 20" storage rack.