Refurbished: DELL Desktop Computer OptiPlex 390 Intel Core i3 2nd Gen 2100 (3.10GHz) 8GB DDR3 250GB HDD Windows 10 Pro - Newegg.com
Amazon.com: Dell Optiplex 390 Business High Performance SFF Desktop Computer PC (Intel Quad-Core i5-2400 up to 3.4GHz, 8GB DDR3, 1TB HDD, HDMI, DVD, Windows 10 Pro 64-bit) (Renewed) : Electronics
Buy Dell OptiPlex 390 SFF Small Form Motherboard F6X5P
OptiPlex 390 Desktop Owner's Manual
Install and boot from an NVMe SSD on a Dell OptiPlex 790 or 990
Restored Dell 390 Desktop PC with Intel Core i3-2120 Processor, 4GB Memory, 500GB Hard Drive and Windows 10 Pro (Refurbished) - Walmart.com
Amazon.com: Dell Optiplex 390 Business High Performance SFF Desktop Computer PC (Intel Quad-Core i5-2400 up to 3.4GHz, 8GB DDR3, 1TB HDD, HDMI, DVD, Windows 10 Pro 64-bit) (Renewed) : Electronics