Hong Kong is cheaper for most electronics, you can request an international warranty and you may have to pay extra for it, though not all retailers are aware of it.
I purchased my 2 laptops in Taiwan with international warranties, and even though windows was in Chinese, they supplied an English version at no extra cost for me.
My UK laptop which i purchased second hand, had no warranty card with it, though HP in Singapore could see it was covered and which retailer it was purchased from. They honoured the warranty.
I just replaced the keyboard myself, at a cost of 120$

pretty damn expensive considering its 3 years old. Works fine though!
Hong Kong is the place I guess for cheap everything, no water to cross and by a large population, plus there are large export orders from Hong Kong, so they will be dealing in quantity purchasing and getting better discounts.
Song Brothers is one of the largest importers of electrical and photography goods in Singapore and they distribute within Sim Lim, Funan and the local area, though still expensive when compared to Europe, even before the $ became strong. Places in Europe that have large GST like Scandinavia appear to have good discounts and better specs than the UK. I do know that when as I was doing online computer components, from Denmark, we could provide better build custom computers, cheaper than the UK, before GST.