Florr Mattress Needed, Urgent...

I have decided against a bed frame as I did not want the rigidity, of my room's layout, that comes with it.

I am very keen on just a mattress on the floor. But up til now, I have only been able to locate 2 shops(excluding Ikea), one Tatami Shop in Esplanade and the other one, System Mind Platforms in Millenia Walk.

Before I end up sleeping on the floor, I need to get that mattress first.

Does anyone know where can I find a Futon mattress or Tatami bed?