Hey, you can check out this electronics store on 5/F at iSquare (Tsim Sha Tsui MTR Station, exit R). I remember seeing the LX3 case there for about $100+ SGD or so. I can't remember the exact price, but I know it wasn't cheap.
This is selling at around HK$300 at Sim City (Sim City, 47-51 Shan Tung Street [FONT=宋]旺角山東街[/FONT], Mongkok) there are tons of electronic stores inside - forgot which shop...
If you are looking for the Japan version, then it will be a lot harder to find (and a lot more expensive) as it is very popular in Japan. If you can read Japanese, you can go to their website and look: http://club.panasonic.jp/mall/lumixclub/open/index.html