Hi Ryes
I bought my storage rack from my aunt's hardware shop, about $260, depending on your actual size. You can basically measure the length n breath n height n she can calculate how many pieces of steel supports and planks u need. but u need to ask your contractor to transport it and fix it up for u (unless u like to diy). the wooden planks are raw solid plywood, what i did was buy a can of varnish to varnish it.
In case you're interested, my aunt's hardware shop:
Teng Seng Hardware
Blk 338 Ang Mo Kio Ave 1
#01-1649
Tel:64581633
You can call to make your order or ask for quotation if u prefer that, then arrange for a day to transport it.