Thumb Score: +22

Woot! [woot.com] has Fitvids Cast Iron Plate Weight Plate, 45lbs (Single) for $29.99.
Shipping is free for Amazon Prime Members (must login with your Amazon account and select a shipping address in order for Woot to apply free shipping) or is otherwise $6 per order.

Price:
$20.01 lower (40% savings) than the reference price of $50