Long Tail Feather

About 29s 0c on Beta · Horde (3 hours ago), 20s 35c on Beta · Alliance (15 hours ago), and 30s 0c on Beta · Horde (2 days ago), from player scans. A vendor pays 3s 3c, so the auction house pays 9.1× 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 75s there, against 30s 30c at a vendor.