Walmart offers the Eclipse 42" x 54" Samara Energy-Efficient Thermal Blackout Curtain Panel (single panel) in Espresso, model no. 13437042X054ESP, for $8.97. Opt for in-store pickup to avoid the $5.97 shipping charge. That's the lowest price we could find by $3. This energy-saving and noise-reducing curtain panel purportedly blocks over 99% of light.