If you can find a stock of tantalum film resistors made by the Japanese company Shinkoh in the popular values then you could quickly become rich. Here is what they are worth in unpopular values, which is pretty much all there are on the open market:
http://www.acoustic-dimension.com/re...-resistors.htm.
You can get very close copies, specially made by Audio Note. Sales volume is low though, so they are even more expensive
https://www.hificollective.co.uk/com...nmagnetic.html. You can get them in the popular values. But in the end, they aren't Shinkohs are they ?
Cheers,
GJ