A lot of things to consider when shipping from overseas. Tax, insurance, shipping cost. More importantly, the quality and lost/damaged instruments during shipping. Not forgetting no warrenty/return policy.
Note that the thread you dug up was started in 06. Recent years Sweelee has revised their pricing policies and prices are much more reasonable now. You should compare prices from there first.
Also consider shipping from the US. Gibson is an American brand, and many major retailers such as Guitar Center, Sweetwater, Musician's Friend give very nice discounts, up to 20% at any day, especially at this time of the year when they are clearing their 2014 stock for new models. If the American retailer cannot ship to Singapore then simply use Vpost/borderlinx/comgateway. But you'll need to remember to factor in local Tax, which is 7% of value+shipping+insurance (if above 400 sgd). So far I have shipped 2-3 guitar, even after tax and shipping, still cheaper than local retailers.
However, as i mentioned, Gibson is a brand that does have its hits and misses when it comes to quality. I myself (along with many others at another forum), would not buy a Gibson without trying and examining it.