While I currently have no interest in purchasing a 6000 I was formerly employed as a customer service representive at Amazon.com.
Amazon WILL refund you your money through the A-to-z Guarantee if you don't get the Zaurus you ordered. If you have any problems with this, ask to speak to a supervisor. Supervisors are one above a "Team Lead" and you should have a choice to speak to a lead or supervisor when the call is escalated. They may not get on the phone, they may have to call you back. (Triple sucky, but while I was there they always called back within 24 hours) You may have to wait the 3 extra days past the estimated delivery date but they will give you your money. If you make enough of a stink you can get a small gift certificate too.
The department that deals with 'sellers' is completely seperate from the general customer service you get when you call. For privacy reasons information flows primarily one way. Even if they are shutting this guy down, they can't tell you for 'his' privacy. Sucky I know. However, if he gets enough complaints against him he will be shut down. (Since I didn't work in that department I'm not sure about the whole law enforcment thing.) I think it's three guarantee claims for new sellers as he obviously is.
This does smell a little to me, because at $300 he'd only be able to sell eight a month due to limits put in place by Amazon. That's a little less than the 17 he claimed to have. Also I read he said he sent some priority. That's pretty unusual if you asked for normal shipping. Shipping can get expensive and he doesn't get the full 3.95 or whatever it is they charge on electronics for shipping. Amazon takes a cut out of that too.