SLAC National Accelerator Laboratory seeks fixed-price quotes for 100 polycrystalline optical-grade CVD diamond plates (10x10 mm): 50 at 50 µm thickness and 50 at 100 µm, both polished to Ra <10 nm, with delivery required by end of September 2026. Award will be based on lowest price and best lead time, with the Buy American Act certification applying to awards over $15,000 unit price. Offerors must complete representations and certifications (valid for one year), register in SAM, and provide HTS code and ECCN if applicable. This is product-only; no