"Please help us support women living with breast cancer," the Trade Me posting says.
The auction, which closes tomorrow morning, has received more than 31,000 hits and 91 bids.
The top bid currently sits at $704.
"The level of bidding on the sign on Trade Me has exceeded our expectations - we're thrilled that a simple spelling mistake will earn us hundreds of dollars, and very grateful to Wellington City Council for thinking of us, and for making the mistake in the first place," said Breast Cancer Foundation chief executive Van Henderson.