25 U.S.C. § 134

So much of the appropriations of any annual Indian Appropriation Act as may be required to pay for goods and supplies, for expenses incident to their purchase, and for transportation of the same, for the fiscal year for which such appropriations are made, shall be immediately available, upon the approval of such Act, but no such goods or supplies shall be distributed or delivered to any of said Indians prior to the beginning of such fiscal year.