Dell Optiplex 3070 replacement SSD NVMe M.2 256GB with Win 10 Pro 64bit | eBay
Amazon.com: Dell OptiPlex 3060 Mini Tower Computer PC Desktop,Intel Hexa Core i5-8500 3.0GHz up to 4.10GHz,32GB DDR4 Ram 512GB NVMe M.2 SSD+1TB HDD, Built-in WIFI,Windows 11 Pro,Wireless Keyboard & Mouse(Renewed) : Electronics
If you don't buy an Optiplex with the M.2 SSD option, Dell doesn't solder the slot onto the board so you can never install one after the fact. : r/assholedesign