Deviate Fish

About 1s 79c on Beta · Horde (3 hours ago), 2s 0c on Beta · Alliance (3 hours ago), and 3s 75c on Beta · Alliance (7 hours ago), from player scans. A vendor pays 4c, so the auction house pays 42.5× more.

2 recipes: Elixir of Giant Growth and Savory Deviate Delight.

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 34s 1c there, against 80c at a vendor.