Amazon.com: Dell Optiplex 390 Desktop PC - Intel Core i3-2120 3.3GHz 8GB 1.0TB DVDRW Windows 10 Pro (Renewed) : Electronics
Dell W1PTC - CPU Fan and Heatsink Assembly for Optiplex 390 790 990 SFF - CPU Medics
6 units) Dell Optiplex 390 Core i3 SFF with 4GB RAM 250GB HD Windows 10 Pro Dual Screen Ready with Splitters plus (2 Units) Dell E1916H 19" LED Monitors
Solved: 390, CPU upgrades? - Dell Community
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Restored Dell Optiplex 390-SFF WA1-0402 Desktop PC with Intel Core i5-2400 Processor, 4GB Memory, 1TB Hard Drive and Windows 10 Pro (Monitor Not Included) (Refurbished) - Walmart.com