Amazon.com: Dell Optiplex 990 Desktop Computer - Intel Core i7 3.8GHz, 16GB DDR3, New 500GB SSD, Windows 10 Pro 64-Bit, WiFi, DVDRW (Renewed) : Electronics
Refurbished: Dell OptiPlex 990 Ultra Small Form Factor Computer PC, 3.2 GHz Intel i5 Quad Core Gen 2, 4GB DDR3 RAM, 120GB SSD Hard Drive, Windows 10 Home 64 bit - Newegg.com
Dell OptiPlex 990 Mini Tower PC, Intel Quad-Core i7-2600 3.4GHz Proces – TekRefurbs
Dell OptiPlex 990 Ultra Small Computer PC, 2.70 GHz Intel i5 Quad Core Gen 2, 16GB DDR3 RAM, 480SSD Hard Drive, Windows 7 Pro 64 Bit Used. with 19" LCD Monitor - Walmart.com
Dell Optiplex 990/790 SFF/DT Windows 10 Pro Core I5 Quad Core 4GB WiFi ready | eBay
Dell OptiPlex 990 specifications
Dell Optiplex 7010 Desktop PC Basic
Dell OptiPlex 990 Ultra Small Form Factor Desktop Computer PC, 3.2 GHz Intel i5 Quad Core Gen 2, 16GB DDR3 RAM, 500GB Hard Drive, Windows 7 Professional 64 bit (Used) with 19" LCD Monitor - Walmart.com