As one of the developers working on Archaeology, the skill and elite outfits are planned to be exclusively earned via training the skill (that's how we've designed and already developed them), and accounted for it in the skill's balancing.
Obviously, I can't predict the future (and have even less control over it), but I can't see anyone wanting to add it to TH even at a later date. TH has not broken any previous new skill embargo, so precedent should suggest this one will hold firm and, by the time it is up, a fair proportion of players will already have one, if not both, of the outfits, so any market for it on TH would be severely limited anyway.
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