The costs vary.
The program is a USDA run program, but much of it is outsourced to the State Ag departments, who, in turn, outsource some if it to local County Ag departments. So in my case, the quarantine zones and initial inspection was done by the County Ag inspector, The annual inspection of a specific batch of cuttings was done by a State inspector, and final disposition (releasing them to me) was initiated by the County Ag, after inspection by State Ag, The County request is forwarded to state Ag, who forwards it to the USDA, who issues the final release.
The cuttings/plants are inspected yearly, and must be in full leaf for the final inspection, so the quarantine period is usually 2-1/2 years or so, if the cuttings came when dormant.
All imported cuttings are the property of the USDA while they are in quarantine, and until their final written release by the USDA.
There is no charge for the PEQ Permit (Post-Entry Quarantine), but there can be charges for the inspections, which in my case are $67 per visit, if charged. That is the going hourly rate for a County Ag visit.
Each state handles things a little differently, but ultimately it is all a USDA program and under their control and authority.
The permits are very specific. They list what is being imported, from where, and what quantity. They can be amended as situations change.