Home Depot retail stores offer the Scotts Earthgro Mulch 2-Cubic-Foot Bag
in Brown or Red
. That's the lowest price we could find for this ground cover. (For further comparison, a 2-cubic-foot bag of brown mulch at Lowe's costs $1 more.) Sales tax is added where applicable. It's made from 100% shredded wood.
Also available in stores is the Miracle-Gro Garden Soil 1-Cubic-Foot Bag for $2.50. (Lowe's charges the same.) That's another low, by $3. It's a mix of forest products, sphagnum peat moss, and manur.
Of note, you can't order these items online, but you can check for stock at your nearest Home Depot location.