Rode WS3 foam windshield works for spoken word duties, stopping the breathy polosives that destroy your otherwise perfect voiceover.
It also provides protection againt the wind, should you be using your M3 as a location and sound-gathering microphone.
Not quite what you're looking for?
We've got heaps of Rode microphones and accessories here in our webstore (plus a huge amount on the shelves in store at Factory Sound).
If you still can't find what you need, let us know and we'll make sure you get looked after.