I've just bought the mini travel kit for zaurus (not sure about c1000/3000) but all the rest no problem.
£19 including p&p (approx $32). I get mains usb port (plug into socket anywhere in the world and get a powered usb port) car charger (powered usb port from from cigarette lighter) and a z-specific retractable cable that acts as data and charger from usb port (hence the relevancy of the powered usb port devices).
Has the added benefit of also charging/powering my obscure taiwanese mp3 player (20gb ipod ripoff for under £120 - gogopod) and any other usb charged device you might own
addonsworld have large section on ebay - but better selection from their website. Also - and this is a huge plus for me - they use Worldpay as well as paypal. So no stupid paypal account required :-)
I'll add to this post when goods arrive - I'm off to canada in 3 days, if it arrives for then I'll be a happy bunny if not - then they lied on their website :-)