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