We found this at 11 stores including Wayfair, Target, and Walmart. This product sells from $19.99 up to $22.49. Users can save 11% by shopping at Amazon.

Prices are currently typical for this product, ranging from $13 to $21, and the lowest price we've seen is $9.34.

This product is also marketed as the 

Sun Zero Oslo Theater Grade Extreme 100% Blackout Rod Pocket Curtain Panel at Wayfair

,

52"x84" Sun Zero Blackout Oslo Theater Grade Rod Pocket Curtain Panel Gray: Energy Efficient, Noise Reduction, Thermal Insulated at Target

,

Sun Zero Malmo 1-Piece Theater Grade Extreme 100% Blackout Rod Pocket Curtain Panel, 52"X84", Gray at Walmart

,

Sun Zero 84-in Gray Blackout Standard lined Rod pocket Single curtain panel at Lowe's

,

Sun Zero Oslo Theater Grade Extreme Total Blackout Rod Pocket Curtain Panel, 52" x 84", Gray at Amazon

,

Alna Theater Grade Gray Polyester 52 in. W x 84 in. L Rod Pocket 100% Blackout Curtain (Single Panel) at Home Depot

.