I have a special place in my heart for these. In the past couple years, I acquired a perfectly-working Model 100 for $40 off Craigslist and a Model 102 for a bit more from one of the founding editors of MSNBC, who used it in his 90s journalism career.

This book is great, btw: https://archive.org/details/HiddenPowersOfTheTrs80Model100