I would like to get a cheap (<$20) mic for my osmo, preferrably from amazon as I have credit. Any recommendations?
Thank you

I think your budget is really low.  Rode video micro is $60 and its  top natch.  I use my phones headset mic for recording like a lav.  Works for me does a good job.  But in all honestly your Bidget needs to go up at least $100 if you expect any kind of quality.  Another words you get what you pay for.   

trip3980 Posted at 2016-1-12 20:22
I think your budget is really low.  Rode video micro is $60 and its  top natch.  I use my phones hea ...

I have purchased a  Lavalier Wireless microphone system. Its working great. it cost  about 100 dollars.
I have also purchased the Rode  Microvideo  microphone  to use for outdoor work.
I don't understand the logic of using a cheap microphone on an expensive camera.
Why cut corners ?.

I bought the Movo x y dslr mini condenser mic, works well, for me...
Cost $ 29.99
Movo x y dslr condenser mc