I don't think that all the retailers [entirely] know what the conditions are, eg, I know the Warehouse sold Academic upgrades in every store when Vista was released, but the standard upgrade version was only found in select stores - thus, no-one bought the higher priced one. I also know that some staff were specifically told to not check for qualifying ID if they queried this.
JAMMAN2110: Recently I purchased Microsoft Office Outlook 2007 - Academic, online. From a large NZ online retailer.
Academic License entitles students enrolled in an educational institution to get Microsoft Products in a cheaper price or free (via DreamSpark and MSDN AA). It is strictly for educational purpose and not for commercial use. Read about it more here