I did some quick searching on Ebay and all the SRX boards are available everywhere and very cheap!! Approximately 100-150 USD including free delivery ex Japan or other countrys.

My G70 will be delivered next Tuesday so im starting to get very excited!! smile

I picked it up for $690.00 USD... pretty happy with that!!
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Roland G70 / Roland BK9 / Roland GW8-L / Yamaha Motif XS / Technics KN6500