Long Tail Feather

About 30s 0c on Beta · Horde (2 hours ago), 31s 0c on Beta · Horde (20 hours ago), and 69s 99c on Beta · Alliance (21 hours ago), from player scans. A vendor pays 3s 3c, so the auction house pays 9.4× more.

1 recipe: Fletcher's Gloves.

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 10 brings about 2g 85s there, against 30s 30c at a vendor.