I picked up the Audio-Technica ATR-3350 Lavalier Omnidirectional Condenser Microphone from amazon.com. The first think I noticed about it is the obscenely long twenty foot cord. I waded it up and shoved it in a pocket. I had to drill a hole into my GoPro case to accomadate the mic plug which wasn't that big of a deal since I already have a case with the charger port drilled out, I just added a hole to it.
The mic I was able to pinch between the pads in my helmet. Over all the quality of the audio is awesome and I think this is something that I might get around to making some vlogs with.
Here is the first video I made with it back in March. It isn't a very interesting video but I just made it to test it without thinking about what I was actually going to say.