This 4-pack of outlet covers is $14.99 at Amazon. That's a buck below the original price.
It's available in several colors (Brushed Nickel pictured). Shipping is free for Prime members.
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Features Includes 4 duplex wall plates made of solid zinc alloy Brushed nickel finish resists tarnishing and corrosion Each plate measures 3.15"W x 4.92"H Matching colored screws included for installation Compatible with toggle light switches and rotary dimmer switches Backed by a one-year warranty