Set up an alert for Queenstown?

Hi guys, sorry if this has been answered/is obvious…. but I'm looking to find cheap flights to Queenstown from the Gold Coast.. is there a way to set up an alert with OZB when a deal mentioning Queenstown comes up? (besides the generic 'travel' section).

Or some other way to do that on other sites? Basically I've seen great deals floating around in the past, but now that I want one, I'd like to know when they pop up :)

Thanks folks