Value of my Transparent cables?

I have a pair of transparent "the link 100" 15 foot speaker cables. Anyone have an idea what they are worth (ballpark)?

I also have a pair of monster speaker 12 foot copper cables with banana plugs that I've been trying to figure what the value is as well.

Any help appreciated.

Transparent has a upgrade program where you typically get 75% of the value (I think) to a higher model. Not sure if you're just looking for cash or to move up...

Their website posts retail prices also...