I see , how much would it normally cost to wc the cpu and gpu.
Perhaps around $1k? You can do the following to reduce costs as much as possible:
1. Aquacomputer has a flat shipping fee of 37.90 EUR till a certain weight which is apparently quite high. I had shipped 12.5kg actual weight before and vol weight is more than 30kg. You can consider getting cpu block, gpu block, reservoir, D5 pump with pump top, radiator, coolant from them and it will still cost you only 37.90 EUR.
2. You can subscribe to Performance PCs (PPC) newsletter and they will occasionally send you promo codes with minimum purchase value, eg 8% off min US$250 spending excluding shipping. But shipping to SG can be quite ex depending on quantity and weight. You can play with the value in their cart.
3. For fittings, we would recommend the premium bitspower either from PPC or directly purchase from bitspower TW via skype chat. Alternatively, you can buy from barrows@taobao and via ezbuy to bring in to Singapore.
As for tubing, i believe barrows too sell them as well. Or you can try if AQC do sell as well.