My First ThinkPad, an R61 running W11, $25 on cl. How'd I do? : r/thinkpad
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
CMS 2GB (1X2GB) DDR2 5300 667MHZ Non ECC SODIMM Memory Ram Upgrade Compatible with Lenovo® Thinkpad R61 Notebook Series - A38 at Amazon.com
Lenovo Thinkpad R61 RAM-Memory (1 Gig) | Replacement Part
CMS 2GB (1X2GB) DDR2 5300 667MHZ Non ECC SODIMM Memory Ram Upgrade Compatible with Lenovo® Thinkpad R61 Notebook Series - A38 at Amazon.com