I currently use an Audio Technica saxophone mic. on my melodeons and my banjo. Its cost probably equals all the previous tie-clip (and variants) mics I've owned put together, but it works, and very well at that. In my experience cheap mics are a false economy. I've made a mounting bracket for the melodeon, but the built-in clip on the mic just fits on the perchpole in the banjo head. Banjos are notoriously difficult to amplify without feedback, but this solves the problem more effectively than anything short of a VERY expensive free-standing mic.