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Try www.kol.co.nz they have unlimited Dial Up for $9.95 per month.
Read their TOU,its very different.They advertise as unlimted,but they cut you off after 4 hrs,then you have to sign in again.
Oh whoopey do! So if you tie up your phone line for more than 4 hours then really you should be thinking of a second line or Broadband! But then again after install a second line and extra rental on that second line you might as well GET Broadband.
You get what you pay for!
contention ratios of around 923451632:1 my 'observed' speeds are more like 256kbit 

(5/8s of bugger all) and the 2nd is $80mth with a decent cap. Wish that the 1gig cap were higher.(say 5gig would make it worthwhile)
but on the whole