Arch Memory 4GB 240-Pin DDR3 1333 MHz UDIMM RAM for Lenovo ThinkCentre M58p 7483 Series at Amazon.com
Best Buy: Lenovo ThinkCentre Desktop Computer 2 GB Memory 160 GB Hard Drive Black 6137A1U
Lenovo ThinkCentre M58P Upgrade RAM - YouTube
Restored Lenovo ThinkCentre M58P Small Form Factor Desktop PC with Intel Core 2 Duo E8400 Processor, 4GB Memory, 320GB Hard Drive and Windows 10 Pro (Monitor Not Included) (Refurbished) - Walmart.com
OFFTEK 1GB Replacement Memory RAM Upgrade for IBM-Lenovo ThinkCentre M58p (7630-xxx) (DDR3-8500 - Non-ECC) Desktop Memory at Amazon.com
Lenovo ThinkCentre A55 MT Intel Core 2 Duo E4500 2.2GHz 4GB RAM No HDD
LENOVO THINKCENTRE 7484-Y2S INT CORE 2 DUO E8400 3GHz 4GB RAM NO HD | eBay
Restored Lenovo ThinkCentre M58-SFF Desktop PC with Intel Core 2 Duo Processor, 4GB Memory, 1TB Hard Drive and Windows 10 Home (Monitor Not Included) (Refurbished) - Walmart.com