Vindicator's Dreadweave Cuffs

Introduced with Arena Season 3 to replace Veteran's Dreadweave Cuffs, General's Dreadweave Cuffs and Marshal's Dreadweave Cuffs all of which are no longer available for purchase.

Source
The cost is and is available from these PvP vendors:

Champions' Hall, Stormwind

Hall of Legends, Orgrimmar