Small Green Dagger

About 30s 0c on Beta · Horde (3 hours ago) and 30s 0c on Beta · Horde (20 hours ago), from player scans. A vendor pays 1s 46c, so the auction house pays 19.5× more.

It exists in Classic Era too, but with different numbers there.

Sell it on the auction house. After the 5% cut a stack of 1 brings about 28s 50c there, against 1s 46c at a vendor.