I'm selling my barely used FX-500s. I enjoyed them, but they didn't fit me as well as I would have liked. I only logged probably 20 hours on them before I realized they bothered my outer ears. (I have had similar fit problems with the Denon c700s, Hippos, etc. :( )
I have the original packaging and ear tips, but I can't seem to find the case. They are otherwise in near new condition since they really weren't used much.
PM if interested.