This one I like it.
Lovinna - very reasonable
http://www.lovinna.com/Lv-Children-d.html
Lazada - RM 1 k onwards
http://www.lazada.com.my/q-10-solid-wood-single-double-decker-bunk-bed-white-15277169.html?spm=a2o4k.brand-60821.0.0.mLW5dG&ff=1&sc=MZXt&rb=60821
Ikea bunk bed From RM 1 k onwards:
http://www.ikea.com/my/en/catalog/categories/departments/bedroom/19039/
T & N Furniture Sdn Bhd , From RM 898 onwards:
http://www.furniture-malaysia.com/index.php?ws=showproducts&products_id=1732962&cat=Children-Bedroom&subcat=Bunk-Bed#openproducts
Furniture RUN: from RM 1k++
https://www.lelong.com.my/lt1530-02-single-queen-size-wooden-bunk-bed-furniturerun-195017463-2018-08-Sale-P.htm
Grab It - sipeh expensive
http://www.grabit.com.my/bed/bedroom-furniture/kids-bed/herra-triple-bunk-bed.html
Tomato kids - sipeh expensive
http://tomatokidz.com/store/types/2-or-more-kids-room