Inquiry about Uncoated Germanium Windows

I am looking for uncoated germanium (Ge) windows with the following specifications: - Material: Germanium, uncoated (no AR coating) - Diameter: 10 mm - Thickness: 1 mm - Quantity: 10 to 30 pieces for a single order Please quote unit prices for different quantities (e.g., 10, 20, 30, 50 pcs) and provide a formal quotation or proforma invoice. I also need information on surface quality, flatness, and parallelism specifications, along with any available inspection reports. Shipping is required to South Korea; kindly include estimated shipping costs and lead time (production plus delivery). I would also like to know your accepted payment terms (e.g., T/T, PayPal) and minimum order quantity, if any. These windows are intended for optical/LWIR research, so consistent material quality is important.}