Wise Man's Belt

About 38s 0c on Beta · Horde (6 hours ago), 39s 0c on Beta · Horde (23 hours ago), and 80s 0c on Beta · Alliance (1 day ago), from player scans. A vendor pays 2s 78c, so the auction house pays 13× 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 36s 10c there, against 2s 78c at a vendor.