Since the case was not settled with the at-fault party's insurance carrier, you will need to file a lawsuit for negligence against the at-fault party / registered owner of the vehicle.The court filing fee varies from state to state.  You will need to go online or contact a court clerk to obtain the filing fee information; specifically, the filing fee for filing a lawsuit for property damage.In addition to the court filing fee, you will need to pay a process server to serve the summons and complaint (complaint is the lawsuit) on the at-fault party / registered owner of the vehicle.  You can find process servers online or in the Yellow Pages and inquire about their fees.