Have you tried any used shops?
I usually got to Hard-Off a few times a month just to see what is available. I have seen many PS2s. The prices there aren't real cheap but they usually clean things up and make sure they work.
The two I usually go to are in Machida, Hashimoto, and Kobuchi (JR Yokohama line). Some stores are larger and has a higher turn over of stuff.
I have also been to one in Fujisawa and they all have about the same stuff.
ooph, that's a bit far, I have a run down to akihabara, generally they go for about 14,000.
I'm not fussed about condition, controllers or packaging, so hopefully the above, coupled with the lack of overheads in a person to person trade make a 10,000 Yen asking price reasonable. Or not?