Walmart offers the CAP 20-lb. Neoprene Dumbbell Set with Rack, model no. SDNS4B-20A, for $16.99. (For Prime members only, Amazon charges the same with free shipping.) Opt for in-store pickup to dodge the $5.97 shipping charge. That's $43 off list, tied with our October mention, and the lowest price we could find. It includes 2-lb., 3-lb., and 5-lb. pairs.