Iron Grenade

About 32s 0c on Beta · Horde (11 hours ago) and 20s 0c on Beta · Alliance (13 hours ago), from player scans. A vendor pays 5s 0c, so the auction house pays 6.1× 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 10 brings about 3g 4s there, against 50s 0c at a vendor.