Amazon has the 20-Count 42gal Frost King Heavy Duty Contractor Trash Bags (3mil Thick, Black; ‎CB3250) on sale for $13 with free shipping on $35+ or with Prime (extra 5% off with 5+ S&S orders). Designed for heavy garage / yard / construction waste. Roughly 65 cents per bag.

• Top: Some userrs may have an additional 10% off coupon.