Valid search indices for the us locale and the state operation.
The default value is Books, unless mode is specified.
The list of available values are:
Apparel Automotive Baby Books Classical DVD DigitalMusic Electronics GourmetFood HealthPersonalCare Jewelry Kitchen Magazines Miscellaneous Music MusicTracks OfficeProducts OutdoorLiving PCHardware PetSupplies Photo Software SportingGoods Tools Toys UnboxVideo VHS Video VideoGames Wireless