MicroCenter.com has the new AMD Ryzen 5 5600G Cezanne 6-Core 3.9GHz AM4 Boxed Desktop Processor with Wraith Stealth Cooler (100-100000252BO) on sale for $220 with free store pickup only.
Best CPU Deals, Processors on Sale, Intel & AMD Discounts
eBay with Antonline has the AMD Ryzen 9 5950X Vermeer 16-core 3.4 GHz Socket AM4 Desktop Processor (100-100000059WOF) for $710 with free shipping.
If you're willing to risk it, eBay seller b7u_36 (41 ratings/97.4% positive) has a couple left for $295 with free shipping.
eBay with Newegg has it for $304 with free shipping.
On Amazon, the motherboard ($67) and processor ($85) are around $150 together.
MicroCenter.com has the Intel Core i9-11900K 3.5GHz (up to 5.3GHz) Octa-Core Unlocked LGA 1200 Desktop Processor (BX8070811900K) for $450 with free store/curbside pickup. Currently selling for well over $500 at most retailers.
$47 price drop. Amazon has the Intel Core i9-9900KF Coffee Lake 8-Core, 16-Thread, 3.6 GHz (5.0 GHz Turbo) LGA 1151 (300 Series) 95W BX80684I99900KF Desktop Processor Without Graphics for $275 with free shipping. Thanks, Mike!
Ends 8/25. B&H Photo Video has the AMD Ryzen 9 5900X 3.7GHz 12-Core 24-Thread AM4 Desktop Processor for $540 - $75 off with PayPal (redeem offer here*) = $465 with free shipping. Currently selling for $500 at most retailers, including MicroCenter.com.
*To activate the offer, find the "Get $75 off $375+" banner on the PayPal landing page (looks like this) and click the "Save offer" button. Then click "Use offer" button in your PayPal wallet.