Hi - Good PDA! I have one as well, whats your screen like when using your stylus, is it responsive? Mine isn't that good to be honest, but its a great PDA otherwise.
I know a good place to get TOMTOM.. www.tomtom.com
They sell all manner of decent software on there, you can get a kit with the PDA Holder and softweare and wired GPS for good money these days.
Or try Ebay, my mate was charged about £20 and received some nice copies, which were reported! Funny that guy who was selling it isn't now!