I believe supply in the US is stabilising. However, buying from Amazon US means there's no direct shipping to SG. You will have to go thru a forwarder and will also incur GST. It is still cheaper than buying local though.
The other option will be to buy an export set locally. The price is similar to what you will incur buying from Amazon.
I don't think it has stabilised that well yet? SMO Bundle and Neon set are out of stock in Amazon. Come Black Friday, you might not even be able to secure Gray set.
It can be difficult to get popular item/good deals during Black Friday.
I still remember 3 years ago trying to get Vita memory card from US.
Managed to get one from Gamestop only for them to cancel my order later.
If want to buy export set just do it locally.
To be honest IMO getting Qoo10 bundle with 2 games for $590 is probably still the better option. 1 game costs around $70, so 2 is $140. Export set $440. So it's more like $10 difference. As lousy as Maxsoft is, $10 for warranty is not a bad deal.