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At commodity silver pricing, a 15' pair made with around eight twisted 20awg strands per conductor will run you around $1000, plus $100 for a roll of 3/8" polyolefin heat shrink tube from McMaster Carr.
Another suggestion is The Big Twist from Tempo Electric. A few years ago I bought two pairs of 12 gauge solid core silver (one for each amp) for $1600. Since then, prices have risen steeply on both silver and the Teflon tube insulation used.
You probably won't do better than Dave G's suggestion, though.
Try navships on e-bay. He specializes in many different gauge silver plated copper wire, very high quality mil spec. Used on Navy ships and NASA. I’ve purchased a number of his products and find them excellent. Multi strand with each strand silver plated. Have rebuilt a few amps with his wire and to my ear compares well to pure silver wire. I think his thickest gauge is 12, but the prices are so favorable I’ve doubled them up making a braid for speaker cables.
I’ve spoken to this guy: https://www.ebay.co.uk/itm/372560920752 and he’s going to make me a pair of 2m, 8 strand solid silver core cables, terminated with silver spades and built in jumpers for a little over £400.
Cables are assessed for directionality and cryo’d. He’ll also sell them unterminated. He also does interconnects.
I don't know if he ships to the US, but I don't see why he wouldn't, he was very accommodating when I spoke with him.
Prior to that I was looking at https://www.monsterslayer.com/Metals/FineSilver.aspx.
They’ll sell you any length of solid silver core cable at various gauges. You’ll need to coat it yourself though, which is where I gave up.