There's a pretty sweet deal running on eBay right now.
You can get At&t's LTE enabled Lumia 830, unlocked, with both green and black back covers for $146! Yes, you heard that right, $146!
I recently bought one and it is as advertised, it's in new cosmetic condition (9.5/10).
Mine just came in the mail...
It looks like this will run till they are out of stock, and from the looks of it, this deal will end very soon as they are already less than 5 left in stock.
The Lumia 830 is currently sold at Microsoft store for $449 and At&t is selling one for $400 off contract. So you are getting more than 50% off on this one.
So if you are interested, now would be a good chance to snag one before it's out of stock.
Get one now from eBay