Air New Zealand Air Points - Site for checking fares across dates?

Hi all,

I am looking for a site that allows checking of fares across dates. Zuji used to do this very well, unfortunately first they got rid of the NZ site (its now expedia) and just over the past few weeks they seem to have taken the flexible date option off the Aussie site :td:.

Now you have to select a specific date, which is a pain. I need a site that i can search a range of dates (over at least a month) and look for best fares. Does anyone know any that do not require a specific date?

I know some airline sites allow flexible searching across a week or so, but i need to search across all airlines on a route. Baiscially I am looking for something that replicates the functionality that zuji used to offer!

thanks

kayak.com allows you to search +- 3 days and checks over a number of sites. You have to sign up to get the flexible date search. I don't know of anything as good as Zuji used to be though.