I just bought a like-new TRS-80 Model 100 here...
http://www.club100.org/Even if you find a Model 100/102/200 elsewhere, that site is a great resource for the "Model T" laptops.
I had the Model 100 uploading text files to my Amiga 3000 the other day via null modem cable (keeping it on topic!). As a journalist, I recall filing many stories "from the field" using these little laptops.