Self-defense Guns Control Act Article 14

Regarding the purchase according to the provisions of this Act of self-defense guns and ammunition listed in Article 2, the purchase should be executed by the special municipal or county (or county-level city) government may execute purchasing, at a price standard formulated by the special municipal or county (or county-level city) government and reported to the Ministry of the Interior for approval.Guns and ammunition other than those listed in Article 2 may be purchased by the government at a determined price if they come from legal sources and the holder reports and hands them in on his or her own initiative. The purchasing procedure and the price standards for the guns and ammunition shall be determined by the Ministry of the Interior.
中文原文 自衛槍枝管理條例第14條
第二條所列各類自衛槍枝及彈藥,依本條例規定應予收購者,由直轄市、縣(市)政府給價收購;其價格標準,由直轄市、縣(市)政府擬訂,報請內政部核定之。
第二條所列槍枝以外之槍砲彈藥,如有發現或持有,其來源正當自行報繳者,得由政府核價收購;其收購辦法及槍枝、彈藥價格標準,由內政部定之。

English translation for reference only; the Chinese text prevails. Not legal advice.