Section 23
SEC. 23. Purchase of Locally Manufactured Products. All appropriations for the procurement of equipment, supplies and materials authorized in this Act shall be used only for the purchase of locally manufactured equipment, parts, accessories, medicines and drugs, supplies and materials, except when none of the desired quality or standard is available in the market or when the price of the locally manufactured product is more than fifteen percent (15%) of that of a similar product offered by an entity other than a domestic entity pursuant to Section 4 of the Flag Law (Commonwealth Act No. 138, as amended.