Stable Boots

About 25s 0c on Beta · Horde (5 hours ago), 29s 0c on Beta · Horde (22 hours ago), and 12s 0c on Beta · Alliance (24 hours ago), from player scans. A vendor pays 3s 99c, so the auction house pays 6× 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 23s 75c there, against 3s 99c at a vendor.