2GB Memory RAM Upgrade for the Lenovo Thinkpad R61 Series, T60 Series, T61 Series, X60 Series and X61 Series Laptops (DDR2-667, PC2-5300, SODIMM) at Amazon.com
Used Lenovo ThinkPad R61 15.4in. Notebook/Laptop in Black (Intel Core 2 Duo 1.5GHz 2GB 80GB) - Walmart.com
Lenovo ThinkPad R61 Core 2 Duo T8100 2.1 GHz 2GB Ram / NO HDD / NO OS | eBay
Lenovo ThinkPad Laptop R61 14.1" Core 2 Duo 2.1GHz 4GB Ram 250GB Windows 10 Home
How to upgrade RAM memory in Lenovo ThinkPad R61 laptop - YouTube