Walmart offers the Eclipse Thermapanel Room Darkening Curtain Panel in several colors (Black pictured) for $5. (Amazon charges the same for select colors / sizes, with a $25 purchase.) Opt for in-store pickup to avoid the $5.99 shipping charge. That's tied with last week's mention and the lowest price we could find by at least $12. It's available in 54", 63", or 84".