Rugby World Cup fans are snapping up the cheap seats for pool matches, leaving much of the premium seating empty two months out from competition kick-off.

As the last of the tickets for the New Zealand tournament go up for grabs, an assessment of sales shows that the most expensive seating areas are the emptiest.

Of the four ticketing categories available at Eden Park in Auckland, the most expensive Category A is the only one with availability for all five pool matches.

And for the New Zealand versus France fixture, these are the only remaining seats available.

Category A tickets cost $NZ123 ($A96) to $NZ460 ($A358) during pool play.

The New Zealand Herald said the same pattern can be seen at seven stadiums nationwide, including Wellington, Dunedin, Rotorua and Hamilton's Waikato Stadium.

Many fans have been using Twitter to complain of the lack of cheap seats, with one tweeting: "Been trying to buy RWC tickets ... damnit all the cheap seats are GONE".

Another, Becky Kuek, said: "$123+ for s*** tickets at the RWC? ... I think not. Sky Sport and my sofa it is," the newspaper reported.

Despite the complaints, tickets priced $NZ41 ($A32) and under are still available at all stadiums except Eden Park and Waikato, which is close to Auckland.

Tournament organisers released tickets to the knock-out round on Tuesday, the last batch to go on sale ahead of the competition start on September 9.

World Cup spokesman Mike Jaspers said the website had experienced a surge since the last of the pool tickets went on sale on Monday, and sales were still "going strong".

It was revealed last week that 900,000 of 1.6 million tickets had been sold.

This gets organisers 75 per cent of the way to their sales target of $NZ268 million ($A208 million).

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