Plans: Mithril Spurs

About 75g 0s on Beta · Horde (5 hours ago), 10g 38s on Beta · Horde (22 hours ago), and 20g 38s on Beta · Alliance (23 hours ago), from player scans. A vendor pays 25s 0c, so the auction house pays 285× 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 71g 25s there, against 25s 0c at a vendor.