Applying heat to the sticker with a hair dryer works wonders. The heat loosens the glue and makes easier to peel off with out leaving half the sticker behind.
Stacking the 20% off BDay and $5 off with LionHeart Tactics plus the 10% PUR, you can get this used $2.69 at GS. Same trick applies to Angry Birds and MGS as well.
Argh, shows "Temporarily out of stock." when clicking on the 33 new from ... section. Current main price is $32.75 at time of this post. I'm in at $20 when they restock, thanks OP!!
Edit: Still let me buy it from Amazon (the 33 new from section) for $19.99 and burn $10 credit I had for a cool...