Where to buy a bento box in Bangkok?

I'm going to Thailand (Bangkok) and I want know where I can buy bento box and supplies in Bangkok.Where to buy a bento box in Bangkok?
there's a chain of stores called daiso here in bkk, they sell imported things from japan, among others lots of dishes as well as bento boxes. keep in mind that these are the japanese "dollar stores" so dont expect high quality, however it's still good stuff.Where to buy a bento box in Bangkok?
A good Japanese restaurant catering for Japanese might be the best way.