Scroll of Strength II

About 15s 0c on Beta · Alliance (60 minutes ago), 29s 99c on Beta · Horde (5 hours ago), and 15s 0c on Beta · Alliance (16 hours ago), from player scans. A vendor pays 87c, so the auction house pays 16.4× 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 71s 25c there, against 4s 35c at a vendor.