New Zealand's newest party The Opportunities Party, headed by multimillionaire economist Gareth Morgan, is contesting the by-election, standing ex-Morgan Foundation staffer Geoff Simmons.
The Electoral Commission has mailed voting packs to the 45,000 people enrolled to vote in the electorate ahead of voting day next Saturday, February 25.
"If you didn't get yours, you need to contact us now to make sure you're enrolled and ready to vote," the commission's chief electoral officer, Alicia Wright said.
The packs include an "EasyVote" card and Wright said voting would be faster and easier for people who brought the card with them.
Four voting stations have been set up for those who want to cast their ballot earlier.
"Anyone enrolled in the electorate can vote in advance, they don't need a reason," Wright said.
People can also enrol at the early voting stations.
Residents will return to the booths to vote again during the general election later this year.
The commission said residents should check whether they are enrolled by visiting www.elections.org.nz or ringing 0800 36 76 56.