A bit biased and possibly beyond your budget, but I run the Invisio M3*. It's worth spending that money compare to the various throat mics and boom mics out there. You might be able to pick up the odd one off ebay for ~$200.
Throat mics are hit-and-miss. I suspect body fat around the neck makes all the difference between garbles and clear transmission.
* Invisio M3 paired with a Ztac PTT - which I opened, modified and resoldered. How ironic is that?
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