https://sport.woot.com/offers/fitvids-cast-iron-plate-weight-plate-45lbs-single 45-lb. Fitvids Cast Iron Plate Weight Plate (IP45, 810963035045) on sale for $29.99. Shipping is free for Amazon Prime Members (must log in with your Amazon account and select a shipping address in order for Woot to apply free shipping) or is $6 per order.