Haunch of Meat

About 18c on Beta · Horde (8 minutes ago), 7c on Beta · Alliance (25 minutes ago), and 13c on Beta · Alliance (4 hours ago), from player scans. A vendor pays 6c, so the auction house pays 2.8× 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 20 brings about 3s 42c there, against 1s 20c at a vendor.