Buy through Shopee but shipped from China, yes
No local seller is selling the 90° 12VHPWR connector as it's a niche product

There is a shop selling in Shopee but before that can you tell how 16 pin 12VHPWR cable is connected to your PSU?
Is it a direct 16 PIN 12VHPWR from the PSU or is it a 2x8PIN or 3x8PIN 4x8PIN to 12VHPWR
Or you can just tell me the exact model of your PSU, I'll find the information myself