Amazon.com: Dell OptiPlex 780 USFF Desktop Intel Core 2 Duo 3.0 GHz 4 GB RAM 250 GB HD DVD Win Pro 32-Bit (Renewed) : Electronics
8GB -2x4GB Memory RAM Upgrade for Dell OptiPlex 780 SFF, Desktop & Mini Tower PC | eBay
Refurbished: Dell OptiPlex 780 USFF Desktop Intel Core 2 Duo E8400 3.0GHz 4GB DDR3 RAM 250 GB HD DVD-RW WiFi Bluetooth Microsoft Windows 10 Pro - Newegg.com