Japanese PS2s are easy to come by, I recommend the following sites:
http://www.buyrite.nethttp://www.ncsx.com
There are some issues with the memory cards issued with the original Japanese SCPH-10000 -version PS2s working with the US PS2s, but those cards are rare anyway. I have a modified PS2 and it works great.
If you go to buyrite, you can still get the limited-edition white PS2 that comes bundled with GT4: Prologue, killer deal.
Yes, and Japanese driving games rule. Initial D, Kansai Battle, etc... Lots of stuff we don't get here.