Pagan Mantle

About 15s 0c on Beta · Horde (6 hours ago), 15s 0c on Beta · Horde (23 hours ago), and 25s 0c on Beta · Alliance (1 day ago), from player scans. A vendor pays 4s 33c, so the auction house pays 3.3× more.

No. It is in Classic Era too, with the same item level, vendor price and stack size.

Sell it on the auction house. After the 5% cut a stack of 1 brings about 14s 25c there, against 4s 33c at a vendor.