Mattresses in Hong Kong are so expensive!

Ikea cannot be the ONLY place in town for beds. So we were convinced that normal branded mattresses were available in Hong Kong. Yes they are (Simmons, Sealy, and King Koil, plus some more Asian local brands like Slumberland).  But man - these mattresses cost a fortune!  Plus there is usually the Japanese and U.S. models. The Japanese styles are shorter (like 190cm length) and bed is too firm for me.  And they're into space saving, non-pillow top thickness.  Like 8" height.  Does it really save that much more space? Are ceilings lower in Japan too?  The U.S. models can be much longer but the prices are easily 3x the North American prices.  Now the big jump from our Full/Double sized bed to Queen seems not worth it; we should have upgraded before shipping our furniture over to Asia.  That said, no chance in hell a King sized bed will fit into our elevator or flat (actually we didn't measure).  But the more elbowing in bed, the more we'll have to pinch pennies and jump take the plunge.  A ten year investment in a good mattress seems worth it, no?  We got so disillusioned that the hydraulic storage leather bed/headboard seemed very interesting...