This is a fabricated rental item.
We have a variety of rocks and boulders, some are hard plastic shells that can be placed over existing objects and are light weight.
Our larger boulders which were initially produced for the Fast and Furious franchise and are handcarved & foamcoated with a very rigid plaster and hand painted.
Boulders can be painted to create different regions and color tones, inquire about how we can assist you in getting the perfect, realistic look for your event. 
Pricing for small rocks starts at $25 and goes up to $95 for larger boulders.
Add this to your quote and your sales rep will help you make selections based upon your needs.