Walmart offers the Duck Brand Shrink Film Indoor Window Kit 5-Pack for $4.17. (With orders of $25 or more, Amazon charges the same with free shipping.) Opt for in-store pickup to avoid the $5.95 shipping charge. That's $3 below our December mention and the lowest price we've seen. (It's the best deal now by $11.) It includes 62x210" of film.

Update: It's now sold out at Walmart. With orders of $25 or more, Amazon still charges $4.17 with free shipping, as part of its add-on program.