Only place to get the factory one through is the dealer. Dealers charge ALOT for OEM parts, usually alot more than aftermarket parts. I am gonna take a shot at saying ~$350-400 for the front end through Mazda.
As for aftermarket, no one makes a front end for the MP3. Erebuni (I think) is the only company that makes a body kit that I have seen for the Protege. If that is a whole front end and not a lip, then that would fit the MP3. Autoexe makes a front lip. Thats about it. Wings West will have a kit in March and from the prototype pics it looks like a whole new front end, not just a lip.