I have one for sale. It's the AZENTEK DT360 with 1gb of RAM and a 20gb hard drive. It has USB2, a PCMCIA slot with an AT&T Sierra wireless card and install CD - check your local AT&T shop for activation - it includes the SIM card. It's loaded with Windows XP Tablet PC Edition with COA sticker - hand writing and voice recognition. Comes with a good battery, rubber shock bumpers with flip-down screen protector, regulated 12v DC power supply, RAM vehicle mount and original stylus. Excellent condition with no wear spots on the screen. $300 shipped to US address.
More info here with video:http://www.tigerdirect.com/applications ... No=3052487
If that's not too powerful for your application, contact me at firstname.lastname@example.org