Solid Sharpening Stone

About 19s 0c on Beta · Horde (5 hours ago) and 25s 0c on Beta · Horde (22 hours ago), from player scans. A vendor pays 40c, so the auction house pays 45.1× 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 3g 61s there, against 8s 0c at a vendor.