Blood Shard

About 25c on Beta · Horde (58 minutes ago), 25c on Beta · Alliance (3 hours ago), and 24c on Beta · Horde (1 day ago), from player scans. A vendor pays 25c, so the auction house pays 1× more.

No. It is in Classic Era too, with the same item level, vendor price and stack size.

Sell it to a vendor. A stack of 10 brings 2s 50c there — more than the auction house nets after its 5% cut.