What are these worth, and what can I sell them for?

Hi,
Just joined, and this is my first topic Hello everyone.  I have a set of Yamaha NS-10 speakers in good to excellent condition, and would like to sell them.  I can't find anyone who has these for sale so I have no idea what price to put on these.  They work great! I use them all the time with my stereo system.  Love the sound!
I read the Wikipedia info and got the story of what they were used for.   
Here are some links to pictures of them that look just like mine
http://joedotcom.com/dropbox/yamaha-ns10/Yamaha%20NS-10%20-%2001.jpg
http://joedotcom.com/dropbox/yamaha-ns10/NS-10_001.jpg
http://joedotcom.com/dropbox/yamaha-ns10/NS-10_002.jpg
http://joedotcom.com/dropbox/yamaha-ns10/Yamaha%20NS-10%20-%2005.jpg
these are pics just like mine but is some one else. 
Here is the Wikipedia story, Very Interesting,
https://en.wikipedia.org/wiki/Yamaha_NS-10
Does anyone Know what to ask for these speakers?
Thanks!  I would be very thankful to anyone who has any idea.