hi Fenho,
i hear thick LG playmat is the best(i think 18mm, with triple cushion), using a baby friendly material. I am looking for one too but they are extra heavy to carry back from Korea as well (over 10 kg for 1.5x2.4m) so couldn't ask my hubby to bring back when he goes there for business trip.
I however found a thinner LG mat which will do for now, bought mine at Westwood mall in Pokfulam. I bought one and just ordered two more as my girl will be crawling soon.
I will be going over there tomorrow, will find out if they have more for you to buy.
Elsa