I think the problem also was that we had tonnes of Wave 1 Voyagers still shelf warming for ages - Seaspray, Ratchet and Payload still seem to be everywhere.
Having said that though, I think the Highbrow wave wasn't released in great quantities since even online places like RK don't have stock of them and there weren't even that many listed on eBay (believe me, I kept watch for ages and finally sourced one from the US for pretty much AUS Voyager RRP)
There's quite a few more listed now that Taktomy has released their version, so maybe that's your best bet (slightly superior paint apps too).