The Great Singapore Sale (GSS) starts today.
And for the first time, it will go on for 10 weeks instead of the usual eight.
This is to cater to tourists from the Asia Pacific region, whose summer holidays "fall in the June to August period", said Mr Anthony Gan, executive director of the Singapore Retailers Association.
According to MasterCard, which was the official GSS card last year, tourists spent about 15.3 per cent more last year than in 2014.
UnionPay International is the new official card of GSS
This time, tourists can expect goodies like $10 taxi vouchers when they spend a minimum amount at selected outlets using UnionPay cards.
They can also take part in a lucky draw for a return trip to Singapore, including air tickets for two and a hotel stay.
Singaporeans are included as well.
The five biggest spenders each day, both local and foreign, will get a $100 reward.
Singapore Press Holdings (SPH), the official media partner of the GSS, is also offering $320,000 worth of prizes in SPH's Shop and Win draw.
A Subaru XV, A Nissan Sylphy and shopping sprees at Metro are among the prizes up for grabs.
Shoppers can also turn up with their receipts to try out The Maze Craze at Ion Orchard. It is a mini game where participants navigate a small maze and zap QR codes to win prizes.
Mr Tan Ooi Boon, head of integrated sales and print classified at SPH, said they were confident of GSS' success this year.
Despite the rise of online shopping, he pointed out that shopping was a "national pastime" in Singapore.
Mr Tan said people would return to stores as "good customer service never goes out of fashion".