Large Brown Sack

About 1g 97s on Beta · Alliance (4 hours ago), 2g 0s on Beta · Horde (10 hours ago), and 2g 5s on Beta · Horde (1 day ago), from player scans. A vendor pays 25s 0c, so the auction house pays 7.5× 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 87s there, against 25s 0c at a vendor.