Boar Intestines

About 35c on Beta · Horde (6 hours ago), 18c on Beta · Alliance (1 day ago), and 39c on Beta · Horde (1 day ago), from player scans. A vendor pays 18c, so the auction house pays 1.8× more.

1 recipe: Blood Sausage.

It exists in Classic Era too, but with different numbers there.

Sell it on the auction house. After the 5% cut a stack of 20 brings about 6s 65c there, against 3s 60c at a vendor.