I was down at Weird Stuff yesterday and they had a huge box of old PDAs. Now this is one focus of my collection, so sifted through those boxes until after closing time. I found a nice set of m-series devices and an original US Robotics cradle. Here you can see my newly expanded collection arranged on the coffee table.
Starting at the bottom left, going counter-clockwise: US Robotics Pilot 1000, the grand-daddy of them all; A Palm IIIe Special Edition (this one got me through the 90s in geek style); a Palm VII Wireless; Palm IIIc (their first color PDA), and finally the m-series: m100, m150, and m130.