Been looking for 1 myself. I asked around but still no reply from those who say they have one. Been a week already.
They were eggable for a short time after they were introduced. But staff saw the error and disabled the ability so you have to fight them, which was the original purpose. Staff was kind enough to let any egged netherhound stay in existence which turned them into the collectible we see today.
I have one that sits for sale on my res at 150k. I have seen a few go for 90k recently but the auctions have been up to 176k. SOLD
man I just fought 3 today at my op I hate them It would b cool to own the and walk by gloating at them!