Have a look on the george website it gives you the palm operating systems that you'll need to run george.
then have a look on eBay for Palm PDA's, - most off them for sale will list the operating system and be suitable. They usually sell between £5 to £30
Other than that they are pretty primative compared to the average modern mobile - so you'll probably not use any other the other palm features.
Definately worth having - as saves a fair amount at the end of the day when you update from palm to pc
Dave