Schematic: Portable Bronze Mortar

About 50s 0c on Beta · Horde (9 hours ago) and 20s 0c on Beta · Alliance (10 hours ago), from player scans. A vendor pays 4s 62c, so the auction house pays 10.3× 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 1 brings about 47s 50c there, against 4s 62c at a vendor.