Valuing a collection of music (LPs and CDs)

Hello all,
I am in New Zealand. I have a substantial collection of audiophile vinyl LPs and gold CDs (both current titles and out of print titles) that I am trying to have valued for the purpose of insurance. NZ is a small country and there is no-one here with the experience necessary to perform this task. All titles are on an excel file, one page for LPs and the other for CDs. I am willing to pay for this service, and am hoping one of you can put me in touch with someone who is able to help me. Thanks in anticipation for your responses.
Regards,
Tim