Rough Sharpening Stone

About 4c on Beta · Alliance (4 hours ago), 3c on Beta · Horde (10 hours ago), and 5c on Beta · Horde (1 day ago), from player scans. A vendor pays 3c, so the auction house pays 1.3× 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 20 brings about 76c there, against 60c at a vendor.