You are not wrong to say that it is down to 19XX to 21XX SGD for international warranty sets oversea after the exchange rate. Local sets are still pricey.
I understand that forum does not encourage the disclosure of shop prices or that was what I saw on the m4/3 forum. You can always call and ask the usual shops like TK, Alan, John 3:16, SLRR, MS Color to check out the prices.
I'll put it this way, the local warranty set price will allow you to fly to HK, possibly stay one night, buy the lens there (if you know where to look) and fly back to Singapore.