Home Depot offers the Emsco Group Small Textured Resin Landscape Rock for $29.99. Opt for in-store pickup to avoid the $5.99 shipping charge. That's the lowest price we could find by $10, excluding the below mention. It measures 11" x 14-1/2" x 14". Deal ends May 31.
A close price: Walmart has it for $31.82 via pickup.