Scroll of Comprehension

About 37c on Beta · Alliance (7 hours ago), 3s 90c on Beta · Horde (8 hours ago), and 39c on Beta · Horde (2 days ago), from player scans. A vendor pays 37c, so the auction house pays 1× more.

No. It is in Classic Era too, with the same item level, vendor price and stack size.

Sell it to a vendor. A stack of 5 brings 1s 85c there — more than the auction house nets after its 5% cut.