boulder cost per ton installed
1 Boulders can cost upwards of $800 per ton. 2  For example, a volcanic rock can cost $600 per ton. 3  An artic white boulder can cost $150 per ton.4  Natural stone edging that is ideal for gardens and walkways can cost $200 to $600 per ton. Boulders can cost upwards of $800 per ton. 2  For example, a volcanic rock can cost $600 per ton. 3  An artic white boulder can cost $150 per ton.