Why do you need a new one? Have you had the old ones cleaned and flow/leak tested? It's fairly cheap compared to replacement, and then you know if you really need to replace one. Google Cruzin Performance...

To clean the intake, make sure you block the port (about .5" in diameter in the bottom rear of the throttle body bore) for the icm bypass, as the cleaning agent eats out the insulation in the icm stepper motor and causes shorts, icm failure, and likely a burnt up ecu, all serious. To be really safe, remove the TB completely and clean it by wiping with a solvent dampended rag, then spray the rest with TB cleaner.