They're getting rid of Wii,DS,PSP,PS2 & GC games to make room for the expansion of the Vita,Wii U,etc.... sections.
This is happening at every retailer.
Just in case you don't know here's some of the big liquidation style sales & changes that have happened so far this year:
75% off all Gamecube games at gamestop.
All $1 or less used ps2 games were to be thrown in the trash at gamestop. If you can find them in store they will ring up at 2 cents each though...
All used psp & ps2 games are $1 at best buy.
Walmart has de-shelved many Wii,DS & PS2 games and put them in big bins that you have to search through now.
etc,etc,etc....