Underfire:
In regards to cost, some aircraft manufacturers are including RNP procedures in the box to sell aircraft..
Speaking only for "N" registered airplanes, the FAA requires that database and FMS vendors
not include RNP AR IAPs in the database unless the operator and aircraft are RNP AR qualified. The procedures have to go through a second validation including "flyability" for each type of FMS before the RNP ARs can be added to the FMS database. Again, this is a straight forward process for air carriers, but not so for business aviation.
For the relatively few business aviation operators that have the OEM qualified airframe and avionics, and the operator elects to pursue the qualification, the validation process is
sold by Honeywell and Jeppesen.