Let me guess, you're playing as a Paladin or a Death Knight, aren't you?
The Savage Plate Battlegear is a PVP set for Warriors, introduced late in the Burning Crusade expansion. The items were available from reputation vendors as entry level PVP gear, and were class restricted, with class specific set bonuses. As with most PVP and PVE set pieces, only those items wearable by your class are visible on the vendors that sell them. As a Death Knight for instance, you would never see any pieces of Valorous Frostfire gear being sold by Paldesse either.
If you're playing a Paladin, the similar sets available to you are the Crusader's Scaled or Crusader's Ornamented battlegear. If you're playing a Death Knight, I'm sorry to say that you're out of luck - DK's were introduced in Wrath of the Lich King, and Burning Crusade content did not receive many updates to accommodate them - especially not updates to endgame PVP gear that isn't particularly good when compared to greens available in new Wrath zones anyway.