Red Fireworks Rocket

About 10s 0c on Beta · Horde (3 hours ago) and 10s 0c on Beta · Horde (20 hours ago), from player scans. A vendor pays 25c, so the auction house pays 38× 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 47s 50c there, against 1s 25c at a vendor.