Cat Carrier (Siamese)

About 35s 0c on Beta · Horde (8 hours ago) and 20s 0c on Beta · Alliance (10 hours ago), from player scans. A vendor pays 15s 0c, so the auction house pays 2.2× 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 33s 25c there, against 15s 0c at a vendor.