Well, if you go to ebay and type in "Oakley Holbrook" then filter for only completed listings and order them highest price first, The Goldbrook results would be (of pairs that actually sold):
This tells me in an auction they're going for around $300+ right now, in a buy it now listing they're around $350+. And that's on ebay where they're taking away seller fees. From the experience of trying to pick up this set in showpiece condition, I'm convinced most of these sets have something on them already (either from factory or the owners). So to stop messing around and for the next set that I buy to hopefully be the last, I would pay (in a goods payment) what I think is a significant premium over these values (PM and I could talk to anyone in detail about it). I'm looking for a condition that is going to impress me though, and people that know me, know that I'm very detailed.