Scroll of Strength II

About 19s 99c on Beta · Alliance (52 minutes ago), 45s 97c on Beta · Horde (7 hours ago), and 49s 0c on Beta · Horde (1 day ago), from player scans. A vendor pays 87c, so the auction house pays 21.8× more.

1 recipe: Libram of Invocation.

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 5 brings about 94s 95c there, against 4s 35c at a vendor.