Twelve South PlugBug World was announced beginning this year and I have no idea why is it not selling in Singapore yet, not even the Apple Online Store in Singapore.
When Li Xiang went to Hong Kong last week, she bought it for me from the Apple Store in IFC Mall, Hong Kong. It is retailing for HK$348 (S$60). Li Xiang also mentioned that the Twelve South PlugBug World is not displayed on the shelves and you might need to request the store assistant to get it from their storeroom.
The PlugBug charger acts as an US travel adapter for your MacBook Pro/Air MacSafe Power Adapter and on top of that it gives you an additional USB port that allows you to charge your iPhone or iPad. I find it super useful for hotels that has limited power sockets. If you prefer not to attached it to your MacSafe Power Adapter, no worries as it can be used as a standalone USB charger.