Official identification cannot be "bought" in the traditional retail sense; it must be by government agencies after you prove your identity. Depending on the type of ID you need, you will typically visit a local Department of Motor Vehicles (DMV) for state IDs, or a passport acceptance facility for federal travel documents.
Issued by the national government (e.g., U.S. Department of State ) for international travel.
Issued by your state's DMV (or equivalent agency like the Washington DOL ). These are the most common forms of daily identification.