Stable Boots

About 12s 0c on Beta · Alliance (1 hour ago), 25s 0c on Beta · Horde (7 hours ago), and 29s 0c on Beta · Horde (1 day ago), from player scans. A vendor pays 3s 99c, so the auction house pays 2.9× 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 11s 40c there, against 3s 99c at a vendor.