Offered here is a used (about four years) USB cable from Paul Pang Audio. It is in excellent condition and I am replacing it with a shorter cable that fits my current setup better. USPS Priority Mail shipping to US addresses is included in the price.

This description is from Pang's (apparently defunct) web site:

These cables have multi-core silver plated copper alloy conductors and are Teflon-coated. Copper alloy in Teflon-coating provides very high strength, prevents oxidation and resists twisting. So this cable will provide a stable sound quality for a lifetime.

Silver plated is from 10 um to 20 um; silver is from 15% up to 30% of the whole conductor. So thiw cable's silver material is 3 to 6 times to common audio grade cable's 5% silver. Theis USB cables is standard 90 ohm.