Right now you can get a box of 100 Glad® Tall Kitchen Bags (13 gallons) for $9.99. This is after an $5 instant savings applied at checkout. Choose in-store pick up to save on shipping. This makes each bag just 10 cents each.
You can also get 90 Glad® Drawstring Outdoor Trash Bags, Black, 30-gallons for $14.99. This is a great way to save any Staples Rewards you may have that you need to spend.