Coarse Weightstone

About 2s 0c on Beta · Horde (5 hours ago), 1s 11c on Beta · Horde (22 hours ago), and 5s 0c on Beta · Alliance (23 hours ago), from player scans. A vendor pays 10c, so the auction house pays 19× 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 38s 0c there, against 2s 0c at a vendor.