Heavy Silk Bandage

About 18s 0c on Beta · Horde (5 hours ago), 20s 0c on Beta · Horde (23 hours ago), and 38s 0c on Beta · Alliance (24 hours ago), from player scans. A vendor pays 4s 0c, so the auction house pays 4.3× 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 20 brings about 3g 42s there, against 80s 0c at a vendor.