The cost of weight plates will largely depend on the style of the plate, the material used, and the brand of the plates. The following breakdown shows the normal range on a price-per-pound basis (45 lb benchmark) for popular weight plates:Gray Iron Plates - $1.50-$2.00Machined, Non-Calibrated Iron Plates - $1.80-$2.65Calibrated Iron Plates - $2.75-$3.05Rubber-Coated Iron Plates - $2.40-$4.00Basic Rubber Bumper Plates - $1.75-$3.10Competition Rubber Bumper Plates - $2.80-$3.80Urethane Bumper Plates - $2.55-$3.90