Some sellers on eBay who are based in Singapore would entertain this, but all these sellers I've encountered are US-based so I've always used Paypal. If you're considering getting an online account, maybe you can try that out.
If you travel around Asia Pacific a bit, maybe you can try to see in malls of other countries if they have UD? I'm going to Manila end of this month, so I'll try to keep a look out for a counter for you, if you'd like.