Beware, CGW charged me GST even though the actual item value + my shipping costs paid to them less than $400. They use CIF (cargo+ insurance + freight) and have their own formula to calculate freight, and don't use the actual amount. Complained but they ignored me. I have stopped using them since.
I have done some calculation as long as your item is less then USD$274 you will not be charge 7% GST
They also provide repackaging for USD$10 or USD$7 for prim member (I have my package shipping wt reduce from 6.5KG to 4KG )