Best Buy: CMS 2GB (1x2GB) Memory RAM Compatible with Dell OptiPlex 380 DDR3 DIMM CM2566410600DIMM80212
Refurbished: Dell OptiPlex 380 Desktop Computer Core 2 Duo 3.0GHz 8GB DDR3 RAM 500GB HD DVD-RW Microsoft Windows 7 Professional 64-Bit Desktop Computers - Newegg.com
Refurbished Dell Optiplex 380 Desktop PC with Intel Dual-Core Processor, 4GB Memory, 160GB Hard Drive and Windows 10 Pro Monitor Not Included (D380C2D4G160GW10ProKBMI)
Dell Optiplex 380 Mini Tower (MT) Computer (BIOS flash / Linux / Windows / Upgrades) - 8Bit Mammoth
4GB Stick for Dell Optiplex 380 780. DIMM DDR3 Non-ECC PC3-8500 1066MHz RAM Memory. Genuine A-Tech Brand. at Amazon.com