How much for a pair of JBL 4410A studio monitors?

The link with the specs: (Second one from the top.)
http://www.jblpro.com/pages/recording/4400.htm

I'm not a pro with pricing speakers.

So I need an honest answer. They are pretty much like new. Some minor scratches from use, but the foam and everything else is perfect.

With that said, how much should I sell them for...?

Thanks in advance for the help.