Scroll of Protection

About 39c on Beta · Horde (6 hours ago), 25c on Beta · Alliance (1 day ago), and 25c on Beta · Horde (1 day ago), from player scans. A vendor pays 25c, so the auction house pays 1.5× more.

1 recipe: Tenets of the Silver Hand.

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 1s 85c there, against 1s 25c at a vendor.