World Of Warcraft PC clearance @ TRU(possibly YMMV)
 

I don't know if this is universal or not, but I saw these in the clearance bin in one of my local Toys R' US stores.

They had the following for the following prices:

World Of Warcraft: Cataclysm-$4.98
World Of Warcraft: Burning Crusade-$4.98
World Of Warcraft: Mists Of Pandaria-$19.98

This was for the vanilla(non collectors edition) versions.

Cataclysm is also listed as $9.98 on clearance on the TRU website if you can't find it in-store for the $5 price.

http://www.toysrus.com/product/in...Id=4447555

Again I'm not sure if this is a YMMV clearance or not.