Rune of Teleportation

About 20s 0c on Beta · Alliance (54 minutes ago), 35s 0c on Beta · Horde (7 hours ago), and 60s 0c on Beta · Horde (1 day ago), from player scans. A vendor pays 2s 50c, so the auction house pays 7.6× 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 10 brings about 1g 90s there, against 25s 0c at a vendor.