Square Enix wasn't kidding when they said they'd be destroying the old world of FFXIV and creating it anew.
Even at retail, the company seems fit to rid the shelves of all trace of the old version of the game. In a report supposedly issued to a poster on NeoGAF, SE has ordered all remaning copies of FFXIV destroyed. While said retailer is currently unknown, they're being offered $16 for every copy pulled.
With Final Fantasy XIV: A Realm Reborn launching by Q1 2013, it's no surprise that copies of the original are disappearing fast. Those who have purchased it will get access to the new version for free, so it's only natural that Square would remove these as quick as possible to replace them with a new disc later down the line.