Revenue received from hunting privileges, rentals, fuel wood sales, the marketing of pine straw, merchantable timber, forest tree seed, and miscellaneous products on commission lands, excluding Sand Hills State Forest, must be retained by the commission to be used for reforestation of the Manchester State Forest, the development and operation of state forests and forest tree seed orchards, the maintenance of wildlife habitat, and the administration and operation of various programs on commission holdings. The commission may carry forward unexpended funds under this section to be used for those purposes.