The books are probably the biggest seller among the thousands on offer at the five-day event, which finishes today, club president-elect, Mark Willyams said.
"Our customers love their Mills and Boon books . . . and we're selling sacks full of them . . . there's not many left," he said.
The sale is the main fundraising project for the 40-member club and it has been a regular fixture on the holiday calendar for more than 20 years.
"We get good feedback from locals and holidaymakers and it proves that people still like to read and they like a bargain, too," Mr Willyams said.
A queue of about 20 was waiting when the sale opened at 9am on Boxing Day.
The takings topped $11,000 that day and the club expected to raise about $20,000 from this year's sale.
Proceeds would be distributed to the community through about 20 different projects, Mr Willyams said.
Some were youth-focused, such as sponsoring students to take part in an Outward Bound course, a science forum or a leadership course.
Book sale proceeds would also fund a glasshouse for the Salvation Army's community garden and would be used to pay for shelterboxes sent to Samoa in the wake of the tsunami.
Hundreds of books, CDs and magazines are donated by Alexandra and Clyde residents.
Most books are sold for $2, while children's books fetch 50c.
Collector's items can sell for up to $80 and good quality Otago or New Zealand history books for between $10 and $20.
Bluff resident Ruth Sargeant, holidaying in Clyde, said she and her husband were regulars at the sale.
He was looking for cowboy yarns, while she snapped up 10 Mills and Boon books for only $4.
Julia Thiel-Paul, of Alexandra, had some books on plays lined up, as well as a physics textbook.
A recent teaching diploma graduate, she planned to use the books as teaching resources.
Naseby's book sale started as a "one-off" to raise money for cat food but now it is so popular the proceeds could feed masses of hungry felines.
The event, held yesterday in the Naseby Town Hall, raised about $2200 and a queue of more than 100 was waiting at 10am.
The sale is run by the Maniototo Community Library, at the Maniototo Area School.
Librarian Sue Umbers was unsure how long it had been going but it was started to raise funds to feed the library cat, Krum.
Thousands of books are donated and the library also sells off some of its surplus stock.
Some of this year's proceeds had been earmarked for food and veterinary services for Krum, while the remainder would be used to buy "extras" for the library, Mrs Umbers said.
