Grave Moss

About 1s 22c on Beta · Alliance (6 hours ago) and 18s 0c on Beta · Horde (7 hours ago), from player scans. A vendor pays 25c, so the auction house pays 4.6× more.

6 recipes: Elixir of Coalesced Regret, Spellblasting Potion, Shadow Protection Potion, and 3 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 23s 18c there, against 5s 0c at a vendor.