If you specifically want a "paper" bond, your only options are historic collectibles or using an IRS tax refund for Series I Savings Bonds.
The Basics of Treasury Securities - Savings Bonds - TreasuryDirect buy a us treasury bond
As of 2026, the U.S. Treasury for any marketable securities (Bills, Notes, or Bonds). All new purchases are exclusively electronic . If you specifically want a "paper" bond, your