Yup, Zion stem, I'm not sure what retail is but 508phineas can tell you... Should be reasonable!
I explained in a different thread, Milaana maybe, how the spikes are very different here, it is not about how they are spaced in the stem, is the pattern of them and size and everything that is totally different. I still haven't tried it, but I expect this to be far superior to the simpler designs... This is a vigreux cooling spike pattern, I went into more detail about it in the Milaana thread.
I was planning to test the TM, though if it fits (which I'm not sure that it will, I think it's not long enough plain space) the mouthpiece would then be a wide ground glass joint (not nice on the lips), and there would be no way to get a screen in that end where it could be removed later, so yeah I don't think it is going to be a good option for a TM stem!