— Composed of screened dark brown sandy loam fortified with 35% Dark Forest and 1% Gypsum : $69.75: Rich Mix. Composed of screened dark brown sandy loam fortified with 30% Prairie Gold and 1% Gypsum : $64.50: Topsoil. Screened, dark brown, sandy loam : $52.00: Unscreened Topsoil. Unscreened, dark brown, sandy loam : $30.00: …