Ironwood Maul

About 87s 0c on Beta · Alliance (6 hours ago), 1g 1s on Beta · Horde (12 hours ago), and 1g 5s on Beta · Horde (1 day ago), from player scans. A vendor pays 14s 8c, so the auction house pays 5.9× 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 82s 65c there, against 14s 8c at a vendor.