Me. Rev. Stat. tit. 12, § 10803

A clerk or agent appointed by the commissioner under section 10801 to issue licenses or permits or process applications for the moose lottery or antlerless deer permits may charge agent fees as provided in this Part up to a maximum of $6 during a single transaction. For purposes of this section, "transaction" means a single event in which one or more licenses or permits are issued to a person in that person's name.