Copy fees generally cover the time and labor involved with copying. Some states levy a separate fee for "reproduction costs" which cover materials used for copying (i.e. paper, ink, etc.). Some states set copying fees at tiered rates based on number of pages copied.
Reproduction costs refer to materials used for copying, such as paper, ink, wear on machines, etc. These are sometimes calculated separately from "copying fees."
Some state statutes specify allowed charges for postage, shipping, and handling.