GS has this sale every month or so, nothing exciting.
From my experience last month (2/3 games arriving non functional, the working copy of Okami only seems to have survived because it was snug against the instructions in the original box), I advise anyone that doesn't want to have to exchange in store (they will do equal value exchanges if they don't have the game you are returning. They may do equal value anyways, but don't quote me.), to avoid this (or at least only buy cartridge based games), esp if you plan on getting a GCN game.
GS ships in the worst packing I've seen from any online retailer. The games arrive in a "fat" tight sleeve envelope with the boxes stuffed in. This compounds the other issues with GS's shipping, the cases, if not the original box, are VERY flimsy cheep plastic and as a result of the clumsy shipping, will break/splinter in delivery, and rather than be in the actual CD slot, the discs are in a paper envelope (stuck in the instructions slot), GCN games will get damaged during shipping particularly, as they are stuck in a normal size envelope that they will easily shuffle around in.