Hot Deals and RossMAN's GottaDeal.com have had the axim alone for around $275-280 a few times, and SD memory is dirt cheap, so it's an OK deal for used but not mind-boggling.
I'd rather have shiny-new one and a full warranty, plus I hate to buy used from friends/acquaintances in case there is ever a problem. But I'm not on a tight budget so saving $40-50 isn't that important to me.