SLAC National Accelerator Laboratory, operated by Stanford University for the DOE, is seeking a fixed-price quotation for six specified items with delivery to Menlo Park, CA. The procurement requires compliance with the Buy American Act for items over $15,000 and includes a Representations & Certifications Rider. Technical evaluation is based on a plasma polishing method, a 1nm RMS surface finish, and clear apertures as defined in the drawings. Source selection will use the Lowest Price and Technically Acceptable (LPTA) method, with quotes due by COB on May 14, 2026. No on-site services are permitted, and all subcontractors must be registered in SAM.gov.