Amazon offers Prime members the CAP Barbell 40-lb. Dumbbell Set with Carry Case, model no. RSWB-40TPB, for $39.99 with free shipping. (Non-members can spend $49 or more to qualify for free shipping; otherwise, shipping costs $20.62.) That's the lowest total price we could find by $10. It includes two 4-lb. threaded barbells, four 2.5-lb. plates, four 5-lb. plates, and four 1/2-lb. threaded star collars.