Heavy Armor Kit

About 54s 98c on Beta · Alliance (10 hours ago) and 40s 0c on Beta · Horde (10 hours ago), from player scans. A vendor pays 6s 50c, so the auction house pays 8× more.

2 recipes: Forceful Heavy Armor Kit and Mystic Heavy Armor Kit.

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 10 brings about 5g 22s there, against 65s 0c at a vendor.