Plans: Frost Tiger Blade

About 50s 0c on Beta · Alliance (34 minutes ago) and 1g 19s on Beta · Horde (24 hours ago), from player scans. A vendor pays 12s 50c, so the auction house pays 3.8× 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 1 brings about 47s 50c there, against 12s 50c at a vendor.