From experience, it is many times safer to use regular mail if you buy only 1 or 2 coins from USA. I stay in Penang, and it takes about 1 week, and at the most 10 days for coin to arrive from USA. That way you can avoid paying 15% tax as custom don't usually look at regular mail. USPS Express mail is not very safe, and one thing for sure is custom will look at the declared value. Recently I have a USPS EMS parcel that the US Post office treated as regular mail and posted it like another regular mail. Registered mail is best if you want online tracking, from USA right to your local PO. Oh yes, I love Malaysia Post. They are one of the best. I love the Butterworth custom officer too. I just don't like to pay tax.
on contrary, i would opine that, those sub usd100 is most of the time valid those residing in US. And most of them do not ship overseas (if they do, usually they charge usd 20-30). Again, well, if that's the case for ebay pricing comparison, i would say most of the MCC (pandas) sold here in SS are overpriced too..
Here you have ncs/ngc pandas and i prefer pay a few bucks more because i trust in the forum member than buy in ebay.