Copper Chain Vest

About 10s 0c on Beta · Alliance (10 hours ago) and 10s 0c on Beta · Horde (10 hours ago), from player scans. A vendor pays 1s 42c, so the auction house pays 6.7× 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 9s 50c there, against 1s 42c at a vendor.