Iron Grenade

About 10s 0c on Beta · Alliance (5 hours ago), 29s 95c on Beta · Horde (11 hours ago), and 32s 0c on Beta · Horde (1 day ago), from player scans. A vendor pays 5s 0c, so the auction house pays 1.9× 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 10 brings about 95s 0c there, against 50s 0c at a vendor.