Apr 19, 2021 · Landscaping rock prices. Landscaping rock projects cost 250 to 1,500 on average. Landscaping rock prices are 45 to 130 per ton or 50 to 160 per cubic yard to buy river rocks, lava rocks, or decorative stones. Large landscaping rocks cost 100 to 350 per labor cost to install landscape rock adds 25 to 100 per ton.. Landscaping rock .