amazon.com has the AMD Ryzen 7 5800X3D 8-Core/16-Thread Desktop Processor for $316.96 with free shipping.

• 8 Cores and 16 processing threads with AMD 3D V-Cache technology, 4.5 GHz Max Boost, 100 MB cache, DDR4-3200 support, For the advanced Socket AM4 platform, can support PCIe 4.0 on X570 and B550 motherboards