It looks like a great deal!! Newegg has Lumia 2520 in stock for just $279. Though, it is not mentioned whether it is AT&T or Verizon version, but the listing mentions it as LTE version. It also comes with 1-year manufacturer warranty, so it looks like a valid new device.
Microsoft store is also selling AT&T and Verizon Lumia 2520 for a No-contract pricing of $399 and $299 on-contract.