Was excited to get my t21 today from ebay - got this sticky, badly corroded r31 instead. Probably one of the worst condition thinkpads I've ever seen... : r/thinkpad
128MB Black Diamond Memory Module for IBM ThinkPad T Series T21 (Type 2647) SDRAM SO-DIMM 144pin PC100 100MHz Upgrade System Specific Memory - Newegg.com
IBM ThinkPad T21 LAPTOP PENTIUM III 256MB, 18GB HDD DVD WINDOWS 98 OFFICE 2000 | eBay