[Costco] COSTCO: blackout microsuede curtains $35
Each curtain is approx. 4 feet wide by 7 feet tall, two per set.
The available colours were light tan, dark brown, and dark green.
The lowest sale price I'd ever found on similar "blackout" curtains, that didn't actually black out all the light, was $30 each panel!
They are made of polyester and are dry clean only, although you can fluff them in the dryer on low to remove creases. I'm not that picky, I just put them up and they look fine to me.