eBay has the HP AMD A8-7410 4GB DDR3 1TB HDD Win 10 Desktop (260-a114) refurbished for $135 with free shipping. Retail price: $350. Features AMD Carrizo-L A8-7410 2.20GHz Processor, 4GB DDR3-L Memory, 1TB 7200RPM HDD, AMD Radeon R5 Graphics, 90W Power Supply, DVD Writer, 802.11 b/g/n WLAN, Keyboard & Mouse.
eBay has the AMD Ryzen 5 2600X 3.6Ghz 6-Core Desktop AM4 Processor (YD260XBCAFBOX) for $190 with free shipping. Retail price: $400. Features 6 Cores & 12 Threads, 3.6 Clock Speed, 4.2 GHz Maximum Turbo Frequency, AM4 Socket, 16MB L3 Cache, 6 x 512 KB L2 Cache, No Integrated Graphics, 95W TDP.