I have a nearly new Hifiman RE-600s. (This is the "S" model - it doesn't require the adapter for a single-ended output ... it is not the balanced version)
I just missed my return window with hifiman... I have only used 1 pair of ear tips with this - everything else is brand new, never used.
Mint condition - I only used these one time. I found them to have a bit too little bass for my tastes.
Selling for $160 shipped (including paypal /shipping fees)