Mighty Chain Pants

About 1g 20s on Beta · Horde (9 hours ago) and 1g 24s on Beta · Alliance (10 hours ago), from player scans. A vendor pays 12s 21c, so the auction house pays 9.3× 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 1g 14s there, against 12s 21c at a vendor.