Amazon has AMD Ryzen 9 7900X3D 12-Core 24-Thread Desktop CPU Desktop Processor (100-100000909WOF+SWJ) on sale for $388.99 when you 'clip' the $17.03 Coupon found on product page. Shipping is free.

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Newegg also has AMD Ryzen 9 7900X3D AM5 Desktop Processor CPU on sale for $408.99 – $20 off w/ promo code CLDDQ554 = $388.99. Shipping is free.

Specs:

• 12 Cores & 24 Threads
• 4.4 GHz Base Clock
• 5.6 GHz Max Boost Clock
• Socket AM5
• 12MB L2 & 128MB L3 Cache
• Integrated AMD Radeon Graphics
• DDR5-5200 Memory
• Unlocked Processor
• AMD 3D V-Cache Technology
• Zen 4 Architecture