Common · Weapon · Mace · One-Hand
Same as in Classic Era.
About 7s 0c on Beta · Horde (21 minutes ago), 2s 0c on Beta · Alliance (3 hours ago), and 6s 0c on Beta · Alliance (18 hours ago), from player scans. A vendor pays 1s 6c, so the auction house pays 6.3× 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 6s 65c there, against 1s 6c at a vendor.
There's no auction house to price until then.
Beta prices — not launch pricesNormal, PvP, and RP open Nov 4