Heavy Leather Ball

About 90s 0c on Beta · Horde (6 hours ago) and 50s 0c on Beta · Alliance (8 hours ago), from player scans. A vendor pays 5c, so the auction house pays 1,710× 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 5 brings about 4g 27s there, against 25c at a vendor.