If you are looking to pick up Skylanders Giants for the PS3 or 3DS and already have a portal of power, then you might want to checkout goHastings.com. They currently have both the PS3 version and the 3DS version on clearance for just $21.99. You get the Giants game plus Tree Rex in the portal owners pack. It’s a great deal at over 50% off.
Here are the links: (or compare on the Giants game page).