I'll go you even cheaper. Build your own IC's out of pure silver wires and decide for yourself if silver is worth it. Here is a source, under $12/foot.
https://partsconnexion.com/connex-cable-bl-ag-interconnect-cable-2-x-23awg/
Pure Silver Wire
If silver is so good to use why do we not see solid silver speaker cables? Price is not that high- 10ga diameter pure silver 6ft is just under $300. That makes a pair of speaker cables about $1,100 for material. I see the price of some of these cables on the market and $1,100 is a fraction of their asking price.