Rainbow Fin Albacore

About 35c on Beta · Horde (16 minutes ago), 6c on Beta · Alliance (35 minutes ago), and 9c on Beta · Horde (22 hours ago), from player scans. A vendor pays 3c, so the auction house pays 11.1× 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 6s 65c there, against 60c at a vendor.