We found this at eight stores including Wayfair, Walmart, and Home Depot. This product sells from $7.26 up to $19.99. Users can save 63% by shopping at Amazon.

Prices are currently low for this product, typically ranging from $7 to $10, and the lowest price we've seen is $6.

This product is also marketed as the 

Eclipse Phoenix Polyester Blackout Curtain Single Panel at Wayfair

,

Eclipse Blackout Curtains, Darrell Thermaweave Rod Pocket 37 in x 84 in Curtain Panel in Grey, Sold as a Single Curtain Panel at Walmart

,

Darrell ThermaWeave Grey Solid Polyester 37 in. W x 84 in. L Blackout Single Rod Pocket Curtain Panel at Home Depot

,

ECLIPSE Blackout Curtains for Bedroom-Darrell 37" x 84" Insulated Darkening Single Panel Rod Pocket Window Treatment Living Room, Grey at Amazon

,

Eclipse 84-in Grey Blackout Rod pocket Single curtain panel at Lowe's

.