Sega SG-1000

I found a picture of an Sega SG-1000 at , there were also some screenshots from games.. Was that SG-1000 only sold in japan?

I searched on and for it but couldn´t find one. You find lots of Atari 2600 consoles at ebay... but no SG-1000.

Where could I buy one, or try to get one?

What would be a fair price for that vintage console.