It looks like they have a new model:
web page

I'm ignorant about microphones. Are there dynamic mics, condensor mics and ribbon mics? I guess what I'm asking is, since I'm not a musician and don't have a good microphone or know anything really about them, nor the terminology, what would I need to buy that wouldn't cost an arm and a leg to get this thing to do what I want (eliminate harmonics)?

EDIT: oh, I see you already provided a link to a microphone.