Coarse Weightstone

About 4s 50c on Beta · Alliance (2 hours ago), 2s 0c on Beta · Horde (8 hours ago), and 1s 11c on Beta · Horde (1 day ago), from player scans. A vendor pays 10c, so the auction house pays 42.8× 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 85s 50c there, against 2s 0c at a vendor.