Rumsey Rum Black Label

About 14s 50c on Beta · Alliance (5 hours ago), 5s 99c on Beta · Horde (11 hours ago), and 5s 0c on Beta · Horde (1 day ago), from player scans. A vendor pays 50c, so the auction house pays 27.6× 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 10 brings about 1g 37s there, against 5s 0c at a vendor.