The life-size models had been placed at various locations around Bath
Around 30 of the 100 Lions of Bath models have not sold yet, with the recession being blamed.
The 6ft (1.8m) models were installed in the city centre and auctioned in October.
Although one lion went for £15,000, many failed to make their reserve price of just over £1,300.
A similar project two years ago, King Bladud's Pigs, saw all of the animals sold at auction.
The project aims to raise money for local charities. Olympic gold medallist Amy Williams and Jamie Cullum have all supported the project.
Lions of Bath project organiser Megan Witty said: "It's slightly disappointing [to not sold them all].
"But then again, bearing in mind the financial climate we're all in at the moment, not entirely surprising."
The remaining lions are now being sold via an online auction on the
Lions of Bath
website until 22 November.
"We've already had some brilliant bids on at least half of them, over the reserve price up to about £2,000," said Ms Witty.
"It's going to go well [but] the time scale is just slightly longer than we expected.
"They do make the most incredible sculptures. They are hand painted works of art. They look fantastic in gardens, homes and offices.
"They're only about 18in (45cm) wide, so in fact they can go up against walls - some people are having them actually on their dining room table.
"Others are just in the garden, on the patio - they can fit almost anywhere really."
The artists who painted the lions donated their time and experience for free but will get paid 25% when their lions are sold.
The event sponsors then get 20% of the sale price, with all net profits going to local charities Off the Record, the Quartet Community Foundation and the Mayor's Relief Fund for Bath.
Nine of the life-sized lion statues were vandalised in June
A percentage will also be put into a rolling fund for future public art projects in the city.
"It will definitely fund itself, so that's not a problem," said Ms Witty.
"It's just a matter of how much we raise for charity."
The King Bladud's Pigs project took place in 2008 and, with the lions taking place in 2010, Ms Witty said that the streets of Bath "would be free of wild animals" in 2011.
"Every two years is sort of the most one can do these events [but] who knows what will happen in the future.
"I think we'll wait until the economic climate picks up a bit."
The life-size models had been placed at various locations around Bath during an arts project in May, however nine of the lions were vandalised in June.