Wall Shield

About 6s 0c on Beta · Alliance (24 hours ago) and 6s 0c on Beta · Horde (1 day ago), from player scans. A vendor pays 3s 67c, so the auction house pays 1.6× 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 5s 70c there, against 3s 67c at a vendor.