Mystic's Shoulder Pads

About 5s 0c on Beta · Alliance (3 hours ago), 4s 0c on Beta · Horde (9 hours ago), and 4s 0c on Beta · Horde (1 day ago), from player scans. A vendor pays 3s 46c, so the auction house pays 1.4× 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 4s 75c there, against 3s 46c at a vendor.