Amazon.com: Dell Optiplex 990 SFF Desktop Business Computer PC - Intel Core i5-2400 3.10GHz 8GB DDR3 RAM 128GB SSD DVD Windows 10 Professional (Renewed) : Electronics
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Used Dell OptiPlex 990 SFF Desktop PC with Intel Core i5-650 Processor, 4GB Memory, 500GB Hard Drive and Windows 11 Pro (Monitor Not Included) - Walmart.com
Dell Optiplex 990/790 SFF/DT Windows 10 Pro Core I5 Quad Core 4GB WiFi ready | eBay
Refurbished: Dell OptiPlex 990 SFF PC - Intel Core i5 2500 2nd Gen 3.30 GHz 8GB 500GB HDD DVD-RW Windows 10 Pro 64-Bit - Newegg.com