Fading Echo

About 70c on Beta · Alliance (4 hours ago), 75s 0c on Beta · Horde (10 hours ago), and 75s 0c on Beta · Horde (1 day ago), from player scans. A vendor pays 66c, so the auction house pays 1× more.

Yes. It is new in Forever — Classic Era never had it.

Sell it on the auction house. After the 5% cut a stack of 20 brings about 13s 30c there, against 13s 20c at a vendor.