The Kinokuniya at Ngee Ann City is Singapore’s biggest bookstore, but I’d say this is the runner-up. (I hear there’s a huge Times outlet at Punggol that might be bigger… I should visit!) This is the Bras Basah branch of a Singapore retail chain which is called Popular, presumably due to the Chinese habit of naming businesses with aspirational happy adjectives for good luck.
The place wasn’t looking so popular on a Monday afternoon, though, and I only went there to look for a specific kind of 2017 calendar, which they didn’t have. (Apparently the second week of January is too late to buy a calendar/diary/planner thing if you want a good selection to pick from; luckily, I eventually found what I was looking for at NBC Stationery at Raffles City.)