This site sports jaw-dropping cheap versions of popular Autodesk titles like AutoCAD & AutoCAD LT, not to mention Adobe titles, Solidworks, etc. Most are older versions marked as "overstock" or "used" or some other term. Here is the scoop on purchasing this kind of software, specifically the Autodesk titles:

While this company may deliver working software, it is not upgradable. Each piece of software Autodesk sells comes with a unique serial number linked to the original owner. Only the original owner can upgrade that piece of software to a current version. Corporations and educational institutions beware; Autodesk has a License Compliance team that is very keen on getting these illegal titles put away for good. They have been known to take even small companies to court over license infringement.

So there you have it. My assessment is that this isn't a scam Per Se, the risks of purchasing software from this type of site (especially for a business or institution) far outweigh the benefits. Go to an Authorized Reseller to get your software - most offer free support and are staffed with industry experts who can help you if you have a problem. You won't get THAT from a discount software sight.