Use the USPS ZIP code lookup to get some ZIP codes for different Toyota regions (I think there's about a dozen or so).Billybob said:
http://zip4.usps.com/zip4/citytown_zip.htm
Then enter the ZIP code in the "Build and Price your Prius" box on the Toyota Prius page:
http://www.toyota.com/prius/
I think you're looking for option package "AI"?
http://www.toyota.com/vehicles/2004/prius/options.html