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To keep wind noise down on the internal mic. I usually use an rode external mic, but if not, the wind will create a lot of noise. They call it a "dead cat" wind muffler, haha.

Hah great name, i'll improvise with something here. The other day I reduced almost all the wind noise with just a towel on top of the camera, not the most professional solution, but worked.

I believe the cheapest now for me would be a simple lapel microphone plugged into a voice recorder, later I sync it and voila. I accept opinions.

Yep, Lapel into voice recorder works great. I've even seen some lapels that plug into phones and record into your phone and sync.