Despite Autodesk's attempts to suppress resales of its software, eBay continues to advertise that AutoCAD can be purchased from its sellers. The text of an ad served up by Google Search this morning:
Pay Only What You Want at eBay
Buy Direct from Canadians & Save!
When I followed the ad's link, I found that it lead to "Autodesk AutoCAD Release 13 w/ Documentation Pack" with a (current) bid price of CDN$97.10. Another had a BuyItNow price of US$450.