Going price is about 5 cents per square foot.
Local: http://www.menards.com/main/paint/drop-cloths-plastic-sheeting/poly-film/polar-plastics-6-mil-black-poly-all-purpose-plastic-sheeting-10-x-100-roll/p-1626645-c-8188.htm
Global: http://www.amazon.com/TRM-Manufacturing-610B-Weatherall-Plastic/dp/B00IG7QK7Q/ref=sr_1_1?ie=UTF8&qid=1412364869&sr=8-1&keywords=6+mil+poly#customerReviews
