There is the Royal Selangor Pewter Gallery on the western end of Clarke Quay. Walk through the back where pewter-casting demos are running, then  buy the beautiful shiny stuff in the retail cabinets. It also handles pewtersmithing courses.

“Royal Selangor is the world’s largest pewter company. Renowned for innovative designs and craftsmanship, they strive to create objects of desire in precious pewter. Discover the heritage, beauty and versatility of pewter and the rich history of Royal Selangor. A must-see is the Royal Selangor showroom with 3,000 square feet of retail space carrying a dazzling array of exclusive products of Roayal Selangor and those of their sister company, Comyns.” (1)

[1]-http://www.myonlinetour.com/poi/royalselangor