Gelatinous Goo

About 2s 0c on Beta · Alliance (11 hours ago) and 2s 0c on Beta · Horde (11 hours ago), from player scans. A vendor pays 1s 95c, so the auction house pays 1× more.

No. It is in Classic Era too, with the same item level, vendor price and stack size.

Sell it to a vendor. A stack of 5 brings 9s 75c there — more than the auction house nets after its 5% cut.