Restored Dell OptiPlex 755 Tower Desktop PC with Intel Core 2 Duo E6550 Processor, 4GB Memory, 1TB Hard Drive and Windows 10 Home (Monitor Not Included) (Refurbished) - Walmart.com
A-Tech 8GB (4X 2GB) Max Memory RAM Kit for Dell OptiPlex 755, 745, 740, (MT, DT, SFF) - DDR2 667MHz PC2-5300 Non-ECC DIMM Upgrade at Amazon.com
Dell Optiplex 755 Compact Computer; base (CMPUDL755CBB)
Optiplex 755, ram - Dell Community
512MB DDR2 Memory Upgrade for Dell OptiPlex 755 PC2-5300 Non-ECC DIMM RAM at Amazon.com
Dell OptiPlex 755 Tower Core 2 Duo 3 GHz - HDD 1 TB RAM 4GB | Back Market
1GB RAM Memory Upgrade for the Dell Optiplex 755 Desktop | eBay
Refurbished: Dell Optiplex 755 Small Form Factor Desktop (R2/Ready for Reuse) with Intel Celeron 430@1.80GHz, 2GB RAM, 80GB HD and licensed Windows 7 Home Premium from a Microsoft Authorized Refurbisher - Newegg.com
Beagle Hardware -Dell Optiplex 755
Dell OptiPlex 755 Desktop Computer, Intel Core 2 Duo Dual-core (2 Core) 2 GHz, 2 GB RAM DDR2 SDRAM, 80 GB HDD, Small Form Factor - Walmart.com
8GB 4X2GB Dell OptiPlex 755 Series Desktop/PC DDR2 PC2-5300 RAM Memory at Amazon.com