Walmart offers the CAP Barbell 2" 45-lb. Olympic Plate for $26.95. Opt for in-store pickup to cut it to $25.58. That's $22 under the best price we could for a similar 45-lb. plate elsewhere, outside of the mention below. It's made of solid cast iron and features smooth edges and extra rib support.

A close price: Amazon has it for $26.95 with free shipping for Prime members.