This deal has ended.
Home Depot now has this 4' x 4' Raised Garden Bed priced at only $9. It's currently backordered, but you can still place your order and it will ship when restocked (and with Home Depot, that will likely be soon). This features a pressure-treated wood body, galvanized steel hardware, and has received 4 out of 5 stars from Home Depot shoppers. Shipping is free and sales tax is charged in most states.