Mar 27, 2018 · Prices range from $199.99 to $349.99, depending on the model at Nice Planter. Above: A 13-inch-deep Corten Steel Raised Garden measures four feet square; $229.99 from Veradek. Above: A portable 16-inch Corten Steel Planter Box on wheels comes with a set of four casters; $480.99 at All Modern. Above: A 40-by-40-inch square Nice Corten Steel