**[HomeDepot.com](http://www.passwird.com/links/BlL4Wy)** has the 10-Pack Enerflex 16″ x 4′ Radiant Barrier for **$8.50** with free site-to-store or free shipping on $45+. Features: Blocks solar heat in summer; retains heat in winter. Positive customer reviews.

* [10-Pack Enerflex 16″ x 4′ Radiant Barrier](http://www.passwird.com/links/UxzG3l) – **$8.50**
* [50-Pack Enerflex 16″ x 4′ Radiant Barrier](http://www.passwird.com/links/fGdhzz) – **$34.30**