There is a new Autocad 2006 that is unregistered for auction on EBAy for $1,200, seems like a good deal, caheck it out at
http://cgi.ebay.com/Autocad-2006-brand-new-in-box-unregistered-unused_W0QQitemZ7175001838QQcategoryZ3771QQssPageNameZWDVWQQrdZ1QQcmdZViewItem