The reason why is because that specific AMD Processor is strictly a OEM/TRAY processor and not sold in Retail stores. This specific processor is sold in bulk to OEM manufacturers like Asus, HP, Acer, MSI, Gigabyte,etc.
![Screenshot 2021-02-26 095008.png](/skins/images/91044C31D4879BE484A13BEEFD0E8A4A/responsive_peak/images/image_not_found.png)
You might be able to find one at Ebay or Ali-Baba or some other foreign Retailer but it won't have the 3 year AMD Warranty since OEM/TRAY processors are Warrantied by the Distributor or Vendor selling the processor and not by AMD.