On an annual basis the US uses roughly 100 billion plastic bags with an estimated cost to retailers of 4 billion dollars — a cost of 4 cents per bag. Making that many plastic bags requires roughly 12 million barrels of oil.
Waste Free Roaring Fork was instrumental in working with Carbondale and Aspen to become plastic-bag free at their grocery stores. Whole Foods in Basalt is also plastic-bag free.
Newspaper articles about the single-use plastic-bag ban: