Maybe I was just looking at the wrong moments, but it seems that medical probes are quite rare on the GTN (and thus overprized when there is someone posting an item - in that case 375k, which is over the preferred limit). Other unlocks, especially Artifact unlocks, are quite common and reasonable in price (around 300k).
That's kind of weird considering Artifact unlocks cost much more Cartel Coins than the probes. And you only use the Artifact ones once per character.
How is that on your servers?