I bought a few original Aura's on Ebay just a few months ago for $50 each, 2 for me and a couple for my neighbors. These included free shipping. All came in sealed original boxes and I've been unable to tell them from new ones. I suspect some where new. All were perfect.
I bought one of the original Auras when they first came out so I can compare them. The new ones are no more stable than my original one. They have to be rebooted now and then. But I don't really find this to be much of a problem and the price is good and they're still good reading devices.
Here's a link to the ones I bought:
http://www.ebay.com/itm/Kobo-Aura-Di...jHUogBCEH52XdA
Barry