Where to buy a Topre keyboard in ISO layout (preferably made in Japan)

[prefab]

Hi, I have some questions about Topre keyboards.

I'm a fan/user of Unicomp Model M's (I also have an original Model M not currently in use)
Now I need a silent keyboard for work.
I bought the Matias Quiet Pro. It's OK, but I don't love it, so now I wanna try a Topre.

It seems that 45g is the most common Topre switch, but I maybe I should try 55g since I'm used to Buckling Spring?

I have only found one store that sells (45g) Topre keyboards in ISO-layout (The Keyboard Company):
http://www.keyboardco.com/keyboard/swed ... yboard.asp

1. Are there any other stores that sell Topre keyboards in ISO-layout?
2. How do the Chinese-made keyboards compare to the Japanese-made ones?
3. What is the difference between "Silent" and "Regular" Topre switches?

Thanks in advance for your answers!