71 Pa. Stat. § 190
Whenever any furnishings, or other personal property of this Commonwealth, shall be no longer of service to the Commonwealth, it shall be the duty of the department, board, or commission, in whose possession such property shall be or come, to put such property into the custody of the Department of Property and Supplies: Provided, however, That in the case of any perishable property which is not in the city of Harrisburg, the department, board, or commission, having possession of the same, may sell it in such manner, and upon such terms, as the head of the department, or the board, or commission, may determine: and Provided further, That any road or bridge materials or equipment that have been declared surplus or unserviceable by the Department of Highways shall be offered for sale to counties, cities, boroughs, incorporated towns and townships at the best available price by the Department of Property and Supplies. Written notification of the availability of such material and equipment shall be given to all counties, cities, boroughs, incorporated towns and townships in the highway district in which such material and equipment was last used. If more than one such political subdivision requests the same material or equipment, any sale shall be made to the political subdivision making the highest letter bid. No sale shall be consummated until after a minimum of fifteen (15) days from the date of mailing the notification. All such material and equipment shall be used by the procuring political subdivision upon roads, streets and bridges. All moneys received for such material shall be deposited in the motor license fund.
"Unserviceable property," as used in this section, shall not include products manufactured, grown, or raised, by any department, board, or commission, or by the inmates or patients of any state institution, or minerals, oil, gas, or other materials, taken from any property of the Commonwealth. It shall include only articles previously purchased by the Commonwealth, or any agency thereof, and paid for out of funds of or in the control of the Commonwealth.
71 P.S. § 190