Today you can get a high-end AMD Ryzen 7 CPU for less than $300 if you're willing to put in a little physical effort. The processor in question is the Ryzen 7 1700X, an eight-core, 3.4GHz processor.
This particular price can be found at Walmart. While you can also grab the 1700X on sale at Newegg ($350 until midnight PDT), Walmart has an extra discount available for people willing to head to a store. As Slickdeals points out, if you opt for in-store pickup, the retailer will drop another $59.38 off the sale price of $355. That's a final cost of about $296.