Elixir of Agility

About 69s 98c on Beta · Horde (3 hours ago), 55s 54c on Beta · Alliance (15 hours ago), and 15s 75c on Beta · Horde (2 days ago), from player scans. A vendor pays 2s 0c, so the auction house pays 33.2× more.

1 recipe: Quickdraw Quiver.

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 13g 29s there, against 40s 0c at a vendor.