Update:
I was waiting for Black Friday on Amazon.com. But there weren't any special prices for notebooks in my range.
I finally bought a 2-in-1 Lenovo Flex5 14" with 8/256Gb 8th gen i5 for US$630 incl. delivery. Delivery was a whoppy US$23 - that's all in below HK$5000
Delivery was given at before 12/12 - it arrived yesterday.
Price is hard to compare because this model can't buy in HK, but a 14" i5 8*** is more like $7000 - so totally worth it.
What I learnt: no point to wait for special dates on Amazon, unless you are really wide open.