Amazon has 40-Count 13-Gallon Hefty Ultra Strong Tall Kitchen Trash Bags (Citrus Twist) for $8.53. Add 3 to cart for $25.62 – 5% when you checkout via Subscribe & Save – 15% off when you clip the coupon on the product page = $23.03 + $10 Amazon Credit. Shipping is free w/ Prime or on $35+ orders.
Note: Coupons are usually limited to one per account.