All costs (including those incurred under § 330.106 of this part by the government or the owner) incident to the inspection, handling, cleaning, safeguarding, treating, or other disposal of means of conveyance or products, articles, or plant pests under this part shall be borne by the owner. Services of the inspector during regularly assigned hours of duty at the usual places of duty shall be furnished without cost to the person requesting the services, unless a user fee is payable under § 354.3 of this chapter.