Here is one for $660 in India:

http://vijayawada.quikr.com/ymaha-psr-s710-sell-W0QQAdIdZ242048821

That's all I could find
Eric
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Genos, PSR-S970, TC Helicon VoiceLive3, Mackie 802-VLZ3 Mixer, 2 Bose L1 Pro16, Electro-Voice ZXA1 Subwoofer