Should be quite a few PA-800s available once the Tyros3 is introduced.

E-bay would be your best bet at that time, although you could also try the "Buy and Sell" section of the Korg forum, located here: http://www.korgforums.com/forum/phpBB2/

Good luck.

Ian
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Yamaha Tyros4, Yamaha MS-60S Powered Monitors(2), Yamaha CS-01, Yamaha TQ-5, Yamaha PSR-S775.