Hi VM,
I guess you've pretty much answered your own question as all companies are looking at cheaper Asian production facilities.
Bosch have moved their belt sales out of Australia and also completely ceasing production of them altogether. Honestly couldn't come a day too soon as their belts were horrendous and constantly glazed their surfaces and stretched to no limits. I have constantly been changing belts on my 3RZ powered Hilux and have now gone to another brand hoping I have more success.
The big names are no where near what they used to be are they ?
I personally have never had an issue with any NGK products and as such have stuck with them. All my engines purr well with them installed.
But in saying that I've found most people that buy stuff on line at a super cheap price generally and I'll repeat that word "generally" .........only get what they pay for.
I'm not trying to have a go here, but this is the way of the world like it or not.
Cheers,
BB