In addition to the plentiful stores and shopping being built at the Singapore casinos, there is already so many shopping options already available for anyone visiting Singapore.  From WikiTravel…

Shopping is second only to eating as a national pastime, which means that Singapore has an abundance of shopping malls, and low taxes and tariffs on imports coupled with huge volume mean that prices are usually very competitive. While you won’t find any bazaars with dirt-cheap local handicrafts (in fact, virtually everything sold in Singapore is made elsewhere), goods are generally of reasonably good quality and shopkeepers generally quite honest due to strong consumer protection laws. Most stores are open 7 days a week from 10 AM until 10 PM, although smaller operations (particularly those outside shopping malls) close earlier — 7 PM is common — and perhaps on Sundays as well. Keep an eye out for the Great Singapore Sale [52], usually held in June-July, when shopping centres pull out all stops to attract punters. Many stores along the shopping belt of Orchard Road and Scotts Road now offer late night shopping on the last Friday of every month with over 250 retailers staying open till midnight.

Antiques: The second floor of the Tanglin Shopping Centre on Orchard and the shops on South Bridge Rd in Chinatown are good options if looking for the real thing (or high-quality reproductions).
Books: Borders at Wheelock Place and Kinokuniya at Ngee Ann City, both on Orchard, are the largest bookstores in Singapore. Many second-hand bookstores are located in Far East Plaza and Bras Basah Complex, where you may attempt to bargain if you are buying a lot.
Cameras: Peninsula Plaza near City Hall has Singapore’s best selection of camera shops. However, there are no great bargains to be had, and many camera stores in Singapore (particularly those in Lucky Plaza and Sim Lim Square) have a reputation for fleecing unwary tourists. The best way is to know what you are looking for and then when you arrive, drop by the shops at the airport’s transit area and take a look at the price and check with them whether they have any promotions. Then go to the downtown shops and compare prices/ packages to see which shop will give you value for money.
Computers: Sim Lim Square (near Little India) is great for the hardcore geek who really knows what he’s after (and at slightly cheaper prices), but Funan IT Mall is a better choice for lesser mortals. Challenger is a local chain that provides a great one-stop option for computer and other electronic (but mostly computer) products. There are 8 locations across the island. If you plan on buying a lot, a membership card might be worth the purchase (S$30) to get some discounts.
Consumer electronics: Very competitively priced in Singapore. Funan IT Mall (Orchard), Sim Lim Square and Mustafa (Little India) are good choices. Avoid the tourist-oriented shops on Orchard Road, particularly the notorious Lucky Plaza, or risk getting ripped off. Local retailer Harvey Norman also has many stores scattered throughout Singapore. Check out the massive Harvey Norman Mega Superstore at Millenia Walk. For any purchases, remember that Singapore uses 230V voltage with a British-style three-pin plug.
Electronic components: For do-it-yourself people and engineers, a wide variety of electronic components and associated tools can be found at Sim Lim Tower (opposite Sim Lim Square), near Little India. You can find most common electronic components (such as breadboards, transistors, various IC’s, etc.) and bargain for larger quantities as well.
Ethnic knick-knacks: Chinatown has Singapore’s heaviest concentration of glow-in-the-dark Merlion soap dispensers and ethnic gewgaws, mostly but not entirely Chinese and nearly all imported from somewhere else.
Fabrics: Arab Street and Little India have a good selection of imported and local fabrics like batik.
Fashion, high-street: Ngee Ann City (Takashimaya) and Paragon on Orchard have the heaviest concentration of branded boutiques.
Fashion, youth: Most of Bugis is dedicated to the young, hip and cost-conscious. Some spots of Orchard, notably the top floor of the Heeren, and Far East Plaza, also target the same market but prices are generally higher. The basements of both Wisma Atria and Ngee Ann City also have loads of options for the young.
Fakes: Unlike most South-East Asian countries, pirated goods are not openly on sale and importing them to the city-state carries heavy fines. Fake goods are nevertheless not difficult to find in Little India, Bugis, or even in the underpasses of Orchard Road.
Food: Local supermarkets Cold Storage and NTUC Fairprice are ubiquitous, but for specialties, Jason’s Marketplace in the basement of Raffles City (Orchard) is one of a number of Singapore’s best-stocked gourmet supermarkets with a vast array of imported products. Tanglin Market Place in the basement at Tanglin Mall on Tanglin Road also has a great selection of groceries. Takashimaya’s basement (Orchard) has lots of small quirky shops and makes for a more interesting browse. For a more Singaporean (and much cheaper) shopping experience, seek out any neighborhood wet market, like Little India’s Tekka Market.
Hi-fi stereos: The Adelphi (Riverside) has Singapore’s best selection of audiophile shops.
Mobile phones: Very competitively priced in Singapore due to high consumer volume, available throughout the country. Phones are rarely if ever SIM locked, so they can be used anywhere, and many shops will allow you to “trade in” an older phone to offset the cost of a new one.
Music: The three-story HMV in the Heeren on Orchard is Singapore’s largest music store. There is also an HMV in the CityWalk mall linking Raffles City and Suntec City Mall. Gramophone, however, provides much better prices on CDs and has an interesting selection. Numerous branches are scattered across the CBD and Orchard Road. Better Gramophone locations are at Capitol Centre at street level on North Bridge Road (across from St. Andrews Cathedral) and at Ngee Ann City in B2.
Scuba gear: The Concourse shopping mall in Bugis has a good selection of dive shops in the basement.
Sports goods: Queensway Shopping Centre, off Alexandra Rd and rather off the beaten track (take a cab), seems to consist of nothing but sports goods shops. You can also find foreigner-sized sporty clothing and shoes here. Do bargain! Expect to get 40-50% off the price from the shops in Orchard for the same items. Velocity in Novena is also devoted to sports goods, but is rather more upmarket. Martial arts equipment is surprisingly hard to find. Most of the clothing shops around Pagoda Street in Chinatown sell basic silk taiji/wushu uniforms. Note that if you plan to buy weapons such as swords, you have to apply for a permit from the local police (should cost around 10$) to get your weaponry out of the country.
Tea: Chinatown has plenty of tea shops, and there are some high-end stores for both Japanese and Chinese varieties in Takashimaya’s basement, but Time for Tea in Lucky Plaza (Orchard) may have the best prices.
Watches: High-end watches are very competitively priced. Ngee Ann City (Orchard) has dedicated stores from the likes of Piaget and Cartier, while Millenia Walk (Riverside) features the Cortina Watch Espace retailing 30 brands from Audemars Piguet to Patek Philippe, as well as several other standalone shops.
For purchases of over $100 per day per participating shop, you may be able to get a refund of your 7% GST at Changi Airport or Seletar Airport, but the process is a bit of a bureaucratic hassle. See Singapore Customs [53] for the full scoop.