Lesser Wizard's Robe

About 3g 0s on Beta · Alliance (3 hours ago), 3g 20s on Beta · Horde (9 hours ago), and 3g 21s on Beta · Horde (1 day ago), from player scans. A vendor pays 13s 38c, so the auction house pays 21.3× 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 2g 85s there, against 13s 38c at a vendor.