A few weeks ago while at my sponsor APD Singapore's office, I was shown these new notecards published by Talisman Publishing. The watercolour artworks are actually from Graham Byfield, the same artist who has created the sketches for Cambridge Sketchbook, London Sketchbook and many more.
It seems like there are currently two series, one for Chinatown and the other for the landmarks of Singapore. Each box has 12 cards.
These should be available at local bookstores in Singapore.