Amazon has the AMD Ryzen 7 5800X3D 3.4 GHz 8-Core 16-Thread Desktop Processor (100-100000651WOF) on sale for 323 - $28 off coupon (check "Apply Coupon") = $295 with free shipping. Cooler not included.

4.5 GHz Max Boost, 100 MB cache, DDR4-3200 support. Socket AM4, can support PCIe 4.0 on X570 and B550 motherboards. One of the best value AMD CPUs for gaming at the end of the AM4 life cycle.