The printers are going "as hard as they can", but public demand for Dirty Politics is unceasing.
After Nicky Hager's book was released on Thursday, the entire first run of 4000 sold out before lunchtime.
Four days and 10,000 copies later, and you'd still be lucky to get your hands on it.
Hager's book, Dirty Politics: How attack politics is poisoning New Zealand's political environment, is based on thousands of emails revealing the extent of the relationship between Slater and prominent National Party figures.
Unity Books Auckland owner Jo McColl said there's been no slowing of interest in the expose.
By the time the store opened on Thursday, all its copies of Dirty Politics had sold via preorders.
An extra 300 books arrived on Friday morning, only to sell out again by Saturday afternoon.
"We didn't have any yesterday," McColl said. "We've ordered another 200, arriving tomorrow morning."
Twitter account @WhaleDump, purporting to belong to the hacker and source of Hager, today promised to release further information online.
McColl said this would likely cause another rush for Dirty Politics. She said book sellers were keeping tabs on the developing news story, owing to its influence on sales.
The executive director and publisher at Craig Potton Publishing, Robbie Burton, said 10,000 books had sold, including forward orders through stores.
"Books we've sold and firm orders combined, we've got just shy of 10,000 books," he said. "And we've sold 1000 e-books as well."
He said the printers were going as hard as they can. "Demand is showing absolutely no sign of diminishing.
"It seems that actually people really do want to read this book. I've never seen anything like this before, in terms of the speed at which it's happening."
Just today, the publishers received 1000 orders.
Wellington and Auckland were the biggest markets, but Burton said "it's coming from all over place".