Thumb Score: +38 Amazon has AMD Ryzen 9 3900X 12-Core 3.8GHz AM4 Desktop Processor w/ Wraith Prism LED Cooler on sale for $399.99. Shipping is free. Thanks SDBuddy Walmart also has AMD Ryzen 9 3900X 12-Core 3.8GHz AM4 Desktop Processor w/ Wraith Prism LED Cooler on sale for $399.99. Shipping is free.