Ask this former Toshiba executive.
How much does that quieter technology cost? And what’s the address of the Clinton foundation?
Well,
Bill did give the chi coms the info on how to make nukes real small.
I doubt the cost is the issue.
The key is a manufacturing technology, and it's simply a matter of finding a vendor willing to sell it to them.
The Soviet Union was able to find a vendor back in the 80's, and it made it more difficult for the US to track their subs. When it became public, I was so pissed I refuse to buy anything from that company, to this day.