All articles, materials, and supplies produced or manufactured under the provisions of this chapter shall be solely and exclusively for public or nonprofit organization use and no article, material, or supplies produced or manufactured under the provisions of this chapter shall ever be sold, supplied, furnished, and exchanged, or given away for any private use or profit, except as allowed by section 20-413, Idaho Code. However, by-products and surpluses of agricultural and animal husbandry enterprises may be sold to private persons, at private sale, under rules prescribed by the board of correction.