What are these cables worth?

Maybe someone here can help me out. I'd like to sell a pair of cables for a friend who's husband has passed away, but I need to determine a fair value. The cables are Vampire Wire "USA #ST-1 Continuous Cast Copper Speaker Cable". Each cable is 24' in length with a pair of gold plated banana plugs at one end and a pair of gold plated pins on the other. Nothing fancy on the sleeve, just black vinyl stuff.

What would be a good price with a quick sale in mind?

Many Thanks.