Are you interest my Second hand 三摺床玉 bought from Pricerite?
It's Grey color and use not more than 8 times.
It's at my Kwun Tong office now.
<SOHO 三摺梳化床,灰色,910WX600/1800DX560HMM,SW-9B>
checked again for you, it is on the Sau Kei Wan Road (Sai Wan Ho area), the very thin foldable 三摺床玉 is $138 (2.5" x6"), the thicker and better quality one is $295 (2.5"x6") and $370 (3"x6"). Hope it helps!