PlayStation 2 has been discontinued in Japan
According to Famitsu (tried cleaning up Google's translation):
Wikipedia has the number at 155.1 million units (as of March 2012).
On December 28, 2012, Sony Computer Entertainment (SCE here
) announced shipments of the PlayStation 2 in Japan having been completed. Thus, the remaining stock is all that's left.
The PlayStation 2, released on March 4, 2000, was the successor to the PlayStation. Following the release of a newer model to decrease size and conserve power, the PlayStation 2 was supported by gamers over a long period of time. In addition, its built-in DVD player also helped boost worldwide sales of more than 150 million units.