Headset mic

I am helping my friend overseas. He has the Audix HT5 headset mic with the Audix RAD360 wireless system. He is looking for a less expensive headset mic that will work with his Audix transmitter. I know that the HT5 uses a TA3F (mini XLR) connection. Does anyone know of an inexpensive headset mic that will work with the Audix system? I have a pretty good Shure wireless system, and I have purchased some extra headset mics by Pyle that work work for the Shure transmitter pack. The Pyle mic is like $13, but it sounds surprizingly good. I already checked with Pyle and they don't seem to have a mic that will work on the Audix system. Any help would be appreciated.