Get these highly-rated CAP Barbell Cast Iron Hex Dumbbells, which drop to as low as $7.48 at Walmart.com. Choose from 10lb to 40lb weights. In-store pickup is free. Shipping adds $4.97 but is free with $50. Even with shipping factored in, these are still the lowest prices we could find by $3 per dumbbell. The 10lb drops from $18.99 to $7.48. The 20 lb falls from $35.99 to $14.96. The 25lb dips from $39.99 to $18.01. Click on this offer to see the other discounts! These dumbbells have a semi gloss finish to prevent rusting. With over 200 reviews, these dumbbells get a rating of 4.6/5 stars. Sales tax is charged in most states.