Filming skits with Galaxy S5

So i'm planning on recording some skit stuff, indoors, and outdoors, but wanted to record it all with my phone seeing as the camera isn't that bad. The main problem though is that the microphone is pretty poor, so does anybody have some inexpensive solutions under $50? It needs to be able to pick me up from a little bit away, and up close, and be able to stay on the phone or easily attach to something so someone isn't holding it.