We do not encourage money shipping because that will pose inconveniences to you and trust problems. How are you going to trust the person? I would suggest you to look for it in major auction sites or to safely speaking at least, using online accounts such as PayPal and so on.
Or, you can go to this Singaporean Ayumi fans forum: "Ayunite!" since over 80% of the members there are Singaporean.
www.ayumi-sg.com/forum/